LDS In what sense are Christians Children of God?

We are not God's Children by sex of a mother and father gods in pre-existence.

Note: Eph 4 is about the whole Church becoming mature, not about an individual.
II Peter 1 defines that Christians are to take on the virtues of God.
Gal 5 speaks of the Fruit of the Holy Spirit in our lives.
Romans 8 we are to walk in the HS.
I Cor 13 is about Agape aka God's Love.
The two great commandments is to Love God and to Love our fellow people.

From LDS sources,
"Thus it is shown that prior to the placing of man upon the earth, how long before we do not know, Christ and Satan, together with the hosts of the spirit-children of God, existed as intelligent individuals,h possessing power and opportunity to choose the course they would pursue and the leaders whom they would follow and obey.i In that great concourse of spirit-intelligences, the Father’s plan, whereby His children would be advanced to their second estate, was submitted and doubtless discussed. The opportunity so placed within the reach of the spirits who were to be privileged to take bodies upon the earth was so transcendently glorious that those heavenly multitudes burst forth into song and shouted for joy."
Chapter 2: Preexistence and Foreordination of the Christ

from ex LDS
Mormon Claims Answered Chapter Ten
Terminology Differences (Main)
http://www.utlm.org/onlineresources/pdf/doesldsstillteachgodonceaman.pdf
LDS Teaching on Lucifer
Letters to the Editor: February 2002

'The doctrine of pre-existence...shows that man, as a spirit, was begotten and born of heavenly parents, and reared to maturity in the eternal mansions of the Father, prior to coming upon the earth in a temporal body...Man is the child of God, formed in the divine image and endowed with divine attributes, and even as the infant son of an earthly father and mother is capable in due time of becoming a man, so that undeveloped offspring of celestial parentage is capable, by experience through ages and aeons, of evolving into a God.' (Encyclopedia of Mormonism, p.1670)

Letters to the Editor: February 2002

Mormon Claims Answered Chapter Ten

JackRT said:

Paul in debating the pagan philosophers on Mars Hill agreed that all humanity were the children of God.

Acts 17:26 And He has made from one blood every nation of men to dwell on all the face of the earth, and has determined their preappointed times and the boundaries of their dwellings, 27 so that they should seek the Lord, in the hope that they might grope for Him and find Him, though He is not far from each one of us; 28 for in Him we live and move and have our being, as also some of your own poets have said, ‘For we are also His offspring.’

Click to expand...

Acts 17 J.B. Phillips New Testament (PHILLIPS)
Bitter opposition at Thessalonica—
17 Next day they journeyed through Amphipolis and Apollonia and arrived at Thessalonica. Here there was a synagogue of the Jews which Paul entered, following his usual custom.

2-9 On three Sabbath days he argued with them from the scriptures, explaining and quoting passages to prove the necessity for the death of Christ and his rising again from the dead. “This Jesus whom I am proclaiming to you,” he concluded, “is God’s Christ!” Some of them were convinced and threw in their lot with Paul and Silas, and they were joined by a great many believing Greeks and a considerable number of influential women. But the Jews, in a fury of jealousy, got hold of some of the unprincipled loungers of the market-place, gathered a crowd together and set the city in an uproar. Then they attacked Jason’s house in an attempt to bring Paul and Silas out before the people. When they could not find them they hustled Jason and some of the brothers before the civic authorities, shouting, “These are the men who have turned the world upside down and have now come here, and Jason has taken them into his house. What is more, all these men act against the decrees of Caesar, saying that there is another king called Jesus!” By these words the Jews succeeded in alarming both the people and the authorities, and they only released Jason and the others after binding them over to keep the peace.

—followed by encouragement at Beroea
10-14 Without delay the brothers despatched Paul and Silas off to Beroea that night. On their arrival there they went to the Jewish synagogue. The Jews proved more generous-minded than those in Thessalonica, for they accepted the message most eagerly and studied the scriptures every day to see if what they were now being told were true. Many of them became believers, as did a number of Greek women of social standing and quite a number of men. But when the Jews at Thessalonica found out that God’s message had been proclaimed by Paul at Beroea as well, they came there too to cause trouble and spread alarm among the people. The brothers at Beroea then sent Paul off at once to make his way to the sea-coast, but Silas and Timothy remained there.

15 The men who accompanied Paul took him as far as Athens and returned with instructions for Silas and Timothy to rejoin Paul as soon as possible.

Paul is irritated by the idols of Athens
16-18a Paul had some days to wait at Athens for Silas and Timothy to arrive, and while he was there his soul was exasperated beyond endurance at the sight of a city so completely idolatrous. He felt compelled to discuss the matter with the Jews in the synagogue as well as the God-fearing Gentiles, and he even argued daily in the open market-place with the passers-by. While he was speaking there some Epicurean and Stoic philosophers came across him, and some of them remarked, “What is this [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse]-sparrow trying to say?” Others said, “He seems to be trying to proclaim some more gods to us, and outlandish ones at that!”

18b-21 For Paul was actually proclaiming “Jesus” and “the resurrection”. So they got hold of him and conducted him to their council, the Areopagus. There they asked him, “May we know what this new teaching of yours really is? You talk of matters which sound strange to our ears, and we should like to know what they mean.” (For all Athenians, and even foreign visitors to Athens, had an obsession for any novelty and would spend their whole time talking about or listening to anything new.)

Paul’s speech to the “gentlemen of Athens”
22-31 So Paul got to his feet in the middle of their council, and began, “Gentlemen of Athens, my own eyes tell me that you are in all respects an extremely religious people. For as I made my way here and looked at your shrines I noticed one altar (one of a number in Athens) on which were inscribed the words, TO GOD THE UNKNOWN. It is this God whom you are worshipping in ignorance that I am here to proclaim to you! God who made the world and all that is in it, being Lord of both Heaven and earth, does not live in temples made by human hands, nor is he ministered to by human hands, as though he had need of anything—seeing that he is the one who gives to all men life and breath and everything else. From one forefather he has created every race of men to live over the face of the whole earth. He has determined the times of their existence and the limits of their habitation, so that they might search for God, in the hope that they might feel for him and find him—yes, even though he is not far from any one of us. Indeed, it is in him that we live and move and have our being. Some of your own poets have endorsed this in the words, ‘For we are indeed his children’. If then we are the children of God, we ought not to imagine God in terms of gold or silver or stone, contrived by human art or imagination. Now while it is true that God has overlooked the days of ignorance he now commands all men everywhere to repent (because of the gift of his son Jesus). For he has fixed a day on which he will judge the whole world in justice by the standard of a man whom he has appointed. That this is so he has guaranteed to all men by raising this man from the dead.”

32 But when his audience heard Paul talk about the resurrection from the dead some of them laughed outright, but others said, “We should like to hear you speak again on this subject.”

33-34 So with this mixed reception Paul retired from their assembly. Yet some did in fact join him and accept the faith, including Dionysius a member of the Areopagus, a woman by the name of Damaris, and some others as well.

Acts 17:26 Word Pictures, Robertson
And he made of one (epoihsen te ex eno). The word aimato (blood) is absent from Aleph A B and is a later explanatory addition. What Paul affirms is the unity of the human race with a common origin and with God as the Creator. This view runs counter to Greek exclusiveness which treated other races as barbarians and to Jewish pride which treated other nations as heathen or pagan (the Jews were lao, the Gentiles eqnh). The cosmopolitanism of Paul here rises above Jew and Greek and claims the one God as the Creator of the one race of men. The Athenians themselves claimed to be antocqonou (indigenous) and a special creation. Zeno and Seneca did teach a kind of cosmopolitanism (really pantheism) far different from the personal God of Paul. It was Rome, not Greece, that carried out the moral ideas of Zeno. Man is part of the universe (verse Isaiah 24 ) and God created (epoihsen) man as he created (poihsa) the all. For to dwell (katoikein). Infinitive (present active) of purpose, so as to dwell. Having determined (orisa). First aorist active participle of orizw, old verb to make a horizon as already in 19:42 which see. Paul here touches God's Providence. God has revealed himself in history as in creation. His hand appears in the history of all men as well as in that of the Chosen People of Israel. Appointed seasons (prostetagmenou kairou). Not the weather as in Isaiah 14:17 , but "the times of the Gentiles" (kairoi eqnwn) of which Jesus spoke ( Luke 21:24 ). The perfect passive participle of prostassw, old verb to enjoin, emphasizes God's control of human history without any denial of human free agency as was involved in the Stoic Fate (Heirmarmenh). Bounds (oroqesia). Limits? Same idea in Job 12:23 . Nations rise and fall, but it is not blind chance or hard fate. Thus there is an interplay between God's will and man's activities, difficult as it is for us to see with our shortened vision.https://www.biblestudytools.com/commentaries/robertsons-word-pictures/acts/acts-17-26.html

He is the way said:

By whatever method we became spirit children we are the spirit children of God the Father and brethren of Jesus Christ as per the Bible:

(New Testament | Matthew 23:8 - 9)

8 But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.
9 And call no man your father upon the earth: for one is your Father, which is in heaven.

(New Testament | Hebrews 12:9)

9 Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?

Who are our parents?:

(Old Testament | Genesis 1:26 - 27)

26 ¶ And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
27 So God created man in his own image, in the image of God created he him; male and female created he them.

Click to expand...

Matthew 23 J.B. Phillips New Testament (PHILLIPS)
He publicly warns the people against their religious leaders
23 1-12 Then Jesus addressed the crowds and his disciples. “The scribes and the Pharisees speak with the authority of Moses,” he told them, “so you must do what they tell you and follow their instructions. But you must not imitate their lives! For they preach but do not practise. They pile up back-breaking burdens and lay them on other men’s shoulders—yet they themselves will not raise a finger to move them. Their whole lives are planned with an eye to effect. They increase the size of their phylacteries and lengthen the tassels of their robes; they love seats of honour at dinner parties and front places in the synagogues. They love to be greeted with respect in public places and to have men call them ‘rabbi!’ Don’t you ever be called ‘rabbi’—you have only one teacher, and all of you are brothers. And don’t call any human being ‘father’—for you have one Father and he is in Heaven. And you must not let people call you ‘leaders’—you have only one leader, Christ! The only ‘superior’ among you is the one who serves the others. For every man who promotes himself will be humbled, and every man who learns to be humble will find promotion.

13-14 “But alas for you, you scribes and Pharisees, play-actors that you are! You lock the door of the kingdom of Heaven in men’s faces; you will not go in yourselves neither will you allow those at the door to go inside.

15 “Alas for you, you scribes and Pharisees, play-actors! You scour sea and land to make a single convert, and then you make him twice as ripe for destruction as you are yourselves.

16-22 “Alas for you, you blind leaders! You say, ‘if anyone swears by the Temple it amounts to nothing, but if he swears by the gold of the Temple he is bound by his oath.’ You blind fools, which is the more important, the gold or the Temple which sanctifies the gold? And you say, ‘If anyone swears by the altar it doesn’t matter, but if he swears by the gift placed on the altar he is bound by his oath.’ Have you no eyes—which is more important, the gift, or the altar which sanctifies the gift? Any man who swears by the altar is swearing by the altar and whatever is offered upon it; and anyone who swears by the Temple is swearing by the Temple and by him who dwells in it; and anyone who swears by Heaven is swearing by the throne of God and by the one who sits upon that throne.

23-24 “Alas for you, scribes and Pharisees, you utter frauds! For you pay your tithe on mint and aniseed and cummin, and neglect the things which carry far more weight in the Law—justice, mercy and good faith. These are the things you should have observed—without neglecting the others. You call yourselves leaders, and yet you can’t see an inch before your noses, for you filter out the mosquito and swallow the camel.

25-26 “What miserable frauds you are, you scribes and Pharisees! You clean the outside of the cup and the dish, while the inside is full of greed and self-indulgence. Can’t you see, Pharisee? First wash the inside of a cup, and then you can clean the outside.

27-28 “Alas for you, you hypocritical scribes and Pharisees! You are like white-washed tombs, which look fine on the outside but inside are full of dead men’s bones and all kinds of rottenness. For you appear like good men on the outside—but inside you are a mass of pretence and wickedness.

29-36 “What miserable frauds you are, you scribes and Pharisees! You build tombs for the prophets, and decorate monuments for good men of the past, and then say, ‘If we had lived in the times of our ancestors we should never have joined in the killing of the prophets.’ Yes, ‘your ancestors’—that shows you to be sons indeed of those who murdered the prophets. Go ahead then, and finish off what your ancestors tried to do! You serpents, you viper’s brood, how do you think you are going to avoid being condemned to the rubbish-heap? Listen to this: I am sending you prophets and wise and learned men; and some of these you will kill and crucify, others you will flog in your synagogues and hunt from town to town. So that on your hands is all the innocent blood spilt on this earth, from the blood of Abel the good to the blood of Zachariah, Barachiah’s son, whom you murdered between the sanctuary and the altar. Yes, I tell you that all this will be laid at the doors of this generation.

Jesus mourns over Jerusalem, and foretells its destruction
37-39 “Oh, Jerusalem, Jerusalem! You murder the prophets and stone the messengers that are sent to you. How often have I longed to gather your children round me like a bird gathering her brood together under her wing—and you would never have it. Now all you have left is your house. I tell you that you will never see me again till the day when you cry, ‘Blessed is he who comes in the name of the Lord!’”

Hebrews 12 J.B. Phillips New Testament (PHILLIPS)
We should consider these examples and Christ the perfect example
12 1-3 Surrounded then as we are by these serried ranks of witnesses, let us strip off everything that hinders us, as well as the sin which dogs our feet, and let us run the race that we have to run with patience, our eyes fixed on Jesus the source and the goal of our faith. For he himself endured a cross and thought nothing of its shame because of the joy he knew would follow his suffering; and he is now seated at the right hand of God’s throne. Think constantly of him enduring all that sinful men could say against him and you will not lose your purpose or your courage.

Look upon suffering as heavenly discipline
4-6 After all, your fight against sin has not yet meant the shedding of blood, and you have perhaps lost sight of that piece of advice which reminds you of our sonship in God: ‘My son, do not despise the chastening of the Lord, nor be discouraged when you are rebuked by him; for whom the Lord loves he chastens, and scourges every son whom he receives’.

7-9 Bear what you have to bear as “chastening”—as God’s dealing with you as sons. No true son ever grows up uncorrected by his father. For if you had no experience of the correction which all sons have to bear you might well doubt the legitimacy of your sonship. After all, when we were children we had fathers who corrected us, and we respected them for it. Can we not much more readily submit to a heavenly Father’s discipline, and learn how to live?

10-13 For our fathers used to correct us according to their own ideas during the brief days of childhood. But God corrects us all our days for our own benefit, to teach us his holiness. Now obviously no “chastening” seems pleasant at the time: it is in fact most unpleasant. Yet when it is all over we can see that is has quietly produced the fruit of real goodness in the characters of those who have accepted it in the right spirit. So take a fresh grip on life and brace your trembling limbs. Don’t wander away from the path but forge steadily onward. On the right path the limping foot recovers strength and does not collapse.

In times of testing be especially on your guard against certain sins
14-17 Let it be your ambition to live at peace with all men and to achieve holiness “without which no man shall see the Lord”. Be careful that none of you fails to respond to the grace which God gives, for if he does there can very easily spring up in him a bitter spirit which is not only bad in itself but can also poison the lives of many others. Be careful too, that none of you falls into impurity or loses his reverence for the things of God and then, like Esau, is ready to sell his birthright to satisfy the momentary hunger of his body. Remember how afterwards, when he wanted to have the blessing which was his birthright, he was refused. He never afterwards found the way of repentance though he sought it desperately and with tears.

Your experience is not that of the old agreement but of the new
18-21 You have not had to approach things which your senses could experience as they did in the old days—flaming fire, black darkness, rushing wind and out of it a trumpet-blast, a voice speaking human words. So terrible was that voice that those who heard it begged and prayed that it might stop speaking, for what it had already commanded was more than they could bear—‘And if so much as a beast touches the mountain, it shall be stoned or thrust through with an arrow’. So fearful was the spectacle that Moses cried out, ‘I am exceedingly afraid and trembling’.

22-24 No, you have been allowed to approach the true Mount Zion, the city of the living God, the heavenly Jerusalem. You have drawn near to the countless angelic army, the great assembly of Heaven and the Church of the first-born whose names are written above. You have drawn near to God, the judge of all, to the souls of good men made perfect, and to Jesus, mediator of a new agreement, to the cleansing of blood which tells a better story than the age-old sacrifice of Abel.

25-26 So be sure you do not refuse to hear the voice of God! For if they who refused to hear those who spoke to them on earth did not escape, how little chance of escape is there for us if we refuse to hear the one who speaks from Heaven. Then his voice shook the earth, but now he promises: ‘Yet once more I shake not only the earth, but also heaven’.

27-29 This means that in this final “shaking” all that is impermanent will be removed, that is, everything that is merely “made”, and only the unshakeable things will remain. Since then we have been given a kingdom that is “unshakeable”, let us serve God with thankfulness in the ways which please him, but always with reverence and holy fear. For it is perfectly true that our ‘God is a burning fire’.