I believe the concept is called “Once Saved Always Saved” where your conduct is irrelevant.
re: “I believe the concept is called “Once Saved Always Saved” where your conduct is irrelevant.”
That’s not exactly true. The correct term is, “security of the believer”. What it means is that a person’s salvation is based on our responding in faith to God’s grace made possible to us by the death, burial, and resurrection of Jesus, the Son of God.
There is nothing we can do to earn that salvation. At the point of salvation, that person becomes a child of God and there are no abortions from the family of God. Jesus said that no one can take His children out of His hand.
Now, having said all of that, while our salvation is not dependent on any “works” to merit it, at the same time, if a person claims to be a Christian, yet never offers any evidence in their life as becoming conformed to the image of Christ’s character, if they continue to live a life in a “continual” state of rebellion against God, that person is not a Christian. James puts it this way:
” What does it profit, my brethren, if someone says he has faith but does not have works? Can faith save him? 15 If a brother or sister is naked and destitute of daily food, 16 and one of you says to them, “Depart in peace, be warmed and filled,” but you do not give them the things which are needed for the body, what does it profit? 17 Thus also faith by itself, if it does not have works, is dead.
But someone will say, “You have faith, and I have works.” Show me your faith without your works, and I will show you my faith by my works. You believe that there is one God. You do well. Even the demons believe—and tremble! But do you want to know, O foolish man, that faith without works is dead?” James 2:18-20
Paul also says:
“What then? Shall we sin because we are not under law but under grace? Certainly not! Do you not know that to whom you present yourselves slaves to obey, you are that one’s slaves whom you obey, whether of sin leading to death, or of obedience leading to righteousness? But God be thanked that though you were slaves of sin, yet you obeyed from the heart that form of doctrine to which you were delivered. And having been set free from sin, you became slaves of righteousness. I speak in human terms because of the weakness of your flesh. For just as you presented your members as slaves of uncleanness, and of lawlessness leading to more lawlessness, so now present your members as slaves of righteousness for holiness.
For when you were slaves of sin, you were free in regard to righteousness. What fruit did you have then in the things of which you are now ashamed? For the end of those things is death. But now having been set free from sin, and having become slaves of God, you have your fruit to holiness, and the end, everlasting life. For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.”
I don’t mean to say that we have the ability to judge the eternal destination of anyone, only God can do that, but, what I am saying is that to say that one’s conduct is irrelevant to one’s salvation is not true.