This is a common but important question.
Acts 16:30-31 says "believe on the Lord Jesus Christ and you will be saved"
But I see many here adding their own conditions to earn salvation.
My question is do we have the right to add our own conditions, if we feel the Bible left out critical information.
Dan, you truly pointed out the serious error of "adding" to "earn" salvation. It leads one to seriously wonder if such a person is truly regenerated if he is in some way earning or to some degree working to add to Christ's accomplished redemption. You don't have true faith solely in Christ if you are helping by earning; so can such a person truly be in a state of truly believing in Christ?
"Jesus then said to the Jews who had believed in him, '
If you continue in my word, you are truly my disciples, and you will know the truth, and the truth will make you free.'” (John 8:31-32 RSV)
That clearly shows that following Jesus is evidence of being a true disciple, not a way to earn it.
"But some one will say, “You have faith and I have works.”
Show me your faith apart from your works, and I by my works will
show you my faith. You believe that God is one; you do well. Even the demons believe—and shudder. Do you want to be shown, you shallow man, that faith apart from works is barren? Was not Abraham our father justified by works, when he offered his son Isaac upon the altar? You see that faith was active along with his works, and faith was completed by works, and the scripture was fulfilled which says, “Abraham believed God, and it was reckoned to him as righteousness”; and he was called the friend of God. You see that a man is justified by works and not by faith alone." (Jas 2:18-24 RSV)
Words usually have more than one meaning and here the key is the word "show". This is not speaking of God declaring one righteous in Christ; but of the believer showing by his life he is righteous in Christ, justified. Merriam-Webster "justified - having or shown to have a just, right, or reasonable basis". This is how the term "justified" is used in: "By no means! Let God be true though every man be false, as it is written, 'That thou mayest be justified in thy words, and prevail when thou art judged.'” (Rom 3:4 RSV)
This is clearly illustrated by the reference to Abraham's offer of Isaac on the altar!
Abram was already declared righteous by the LORD in chapter 15 -
"And he believed the LORD; and he reckoned it to him as righteousness." (Gen 15:6 RSV)
Abraham's offer of Isaac is seven chapters later , showing that he has been truly justified-
"And Isaac said to his father Abraham, 'My father!' And he said, 'Here am I, my son.' He said, 'Behold, the fire and the wood; but where is the lamb for a burnt offering?' Abraham said, 'God will provide himself the lamb for a burnt offering, my son.' So they went both of them together." (Gen 22:7-8 RSV)
The sanctification, our works are just as much of God as any other aspect of our salvation:
"May the God of peace himself sanctify you wholly; and may your spirit and soul and body be kept sound and blameless at the coming of our Lord Jesus Christ.
He who calls you is faithful, and he will do it." (1Thess 5:23-24 RSV)
"Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling; for
God is at work in you, both to will and to work for his good pleasure." (Phil 2:12-13 RSV)