While we do know from the story of Job, and with Peter that the enemy had to ask for permission to test their faith,
We know from the context of the passages that permission was "besought". Now do we have any other examples of demonic attacks on believers that give a "birds eye view" of the interaction between Satan / demonic forces, believer and God?
The closest I can think, off the top of my head is God addressing Adam, Eve and Satan after eating the fruit and God addressing Cain about "sin crouching at your door"; although that passage doesn't say anything about Satan.
there is nothing said that God has not given a general permission to the enemy to tempt or lead away believers by false teachings or by sin.
There's nothing that says that God has either though. So you can't base your objection upon something you can't prove by negation of the other position.
New believers can fall away due to temptation by the enemy or by false teachings.
If God has elected an individual from the foundations of the world to be predestine unto redemption; then in "due time" sent the Spirit to awaken that person, enacting in them saving faith, how can they "fall away" due to Satan's false teachers? Especially when Christ has domain over the kingdom of Satan?
God is the One who holds us in all truth; not we ourselves!
John 16:13
But when He, the Spirit of truth, comes, He will guide you into all the truth; for He will not speak on His own initiative, but whatever He hears, He will speak; and He will disclose to you what is to come.
1 Corinthians 2:13
which things we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual thoughts with spiritual words.
Mark 13:11
"When they arrest you and hand you over, do not worry beforehand about what you are to say, but say whatever is given you in that hour; for it is not you who speak, but it is the Holy Spirit.
Isaiah 59:21
"As for Me, this is My covenant with them," says the LORD: "My Spirit which is upon you, and My words which I have put in your mouth shall not depart from your mouth, nor from the mouth of your offspring, nor from the mouth of your offspring's offspring," says the LORD, "from now and forever."
Romans 8:14
For all who are being led by the Spirit of God, these are sons of God.
The thing is that Jesus said He would pray so that his faith may not fail. Now, why would Jesus need to pray this if Peter's victory was guaranteed?
Note: Jesus doesn't say "I will pray...". He said "I have prayed..." When and how long has that prayer happened / taken place?
The phrase "I have prayed" is "aorist indicative passive" voice. "Indicative" indicates something that happened in the past and "passive" voice is an action enacted upon one other than the subject of the verb. Which what this means "theologically" is that Jesus has been led (in the past - now how far back in the past / all eternity?) to pray for Peter. Praying for Peter was not a conscious thing Jesus "decided" to do "in that moment"; it was driven by a need Jesus intuitively knew was there.
I can imagine it. Jesus is sitting on the throne, and there is a long line of prayers coming his way, and He just says, "Yep, I got the victory." "Next." "Victory" "Victory." "Next." Hours later: "Wait, why am I even doing this?" "The victory is assured, there is no need for me to pray if the outcome is assured." “This is silly and it is a waste of my time.”
Here is a perfect example of considering God with only a carnal mind. I'm assuming you are aware that God is all knowing, all powerful, everywhere present, having no beginning and no end, immortal and without need to rest. Christ knows instinctively based on the Divine entity that He is; to intercede specifically for individuals.
The interceding isn't for the point of "gaining the victory"; it's to bestow upon the person the tools they need at that moment to get through the trial they are facing. It's a "reinforcing" of the armor of God, so to speak; if one would want to use that metaphor.
A one time event of becoming a living son does not guarantee a person remains as a saint or as a living son of God.
Those whom Christ has bought can not be lost. The Scripture is very clear on that.
A believer can die physically; but the guarantee is that they will not die before they have come to faith; and that process, God has planned out from the foundation of the world. How He orchestrates all that in real time while dealing with decisions independent entities make; is mind boggling. But being omnipotent, omniscient, omnipresent, immortal and eternal makes that possible.
In the parable of the prodigal son: We learn that when the son came home and he sought forgiveness with his father, we are told that the son was “dead” and he is “alive again.” So the son was dead spiritually when he was living in sin (i.e. when he was prodigal), and when he came back home to the father and sought his forgiveness, he became alive again spiritually.
And again, this parable is an example of how one won't be lost before redemption is enacted.
Being a son guaranteed him nothing in the fact that he could not die spiritually and put out of his inheritance (i.e. to inherit the kingdom of God).
That is not true; being "a son" guaranteed that he would not pass into eternity before his redemption had been enacted.
For
Galatians 5:19-21 lists certain kinds of sins that we should not do and says that those who do such things will not inherit the Kingdom of God.
That passage and passages like it are a warning. Believers though they do sin, do not live a lifestyle of sin. So thus if you are living a lifestyle of sin, (i.e. you can't overcome the bondage of these such things) you should be worried about whether or not you are truly redeemed.
Now if one finds themselves in this situation; it doesn't mean they are not one of the elect. They may be; and just not had their true faith awakening yet.
