It would have been better for them not to have known the way of righteousness than to have known it and then to turn away from the holy commandment passed on to them.-2 Peter 2:21, BSB
Why do some people apostatize, who at one time professed faith in Jesus Christ, even those who were pastors, ended up leaving Jesus Christ? These false converts even believed that they had the Holy Spirit before they fell away from the faith.
An apostate shows us that they never understood the Holy Scriptures because to understand the Bible, they had to have the Holy Spirit living inside of them in the first place. They think that being a Christian is like joining a club. One day you are a member, and the next you are not. It doesn’t work that way. The membership of the kingdom of heaven is a permanent one. Either you have one or you don’t. Jesus said in John 14:16, “And I will ask the Father, and He will give you another Advocate to be with you forever”
A true Christian will never leave the faith because of Jesus’ prayer for His disciples and every future saint that will believe in Jesus through God’s Word. If you did lose your faith, that meant that Jesus’ prayer did not include you. But, if you have backslid and came back to walk with Christ, that shows that you belong to Him.
31 Simon, Simon, Satan has asked to sift each of you like wheat. 32 But I have prayed for you, Simon, that your faith will not fail. And when you have turned back, strengthen your brothers.”-Luke 22:31-32, BSB
20 I am not asking on behalf of them alone, but also on behalf of those who will believe in Me through their message…24 Father, I want those You have given Me to be with Me where I am, that they may see the glory You gave Me because You loved Me before the foundation of the world.-John 17:20, 24, BSB
A Christian’s faith is secured. A believer will never walk away from Jesus Christ, but those who do walk away, never had a true relationship with Christ. This is explained in 1 John 2:19. Read below.
The words in red are the Scriptures and in bold black is my commentary.
“They went out [by apostatizing] from us, but they did not belong to us [meaning they were never saved in the first place]. For if they had belonged to us [by showing their perseverance in the faith through the indwelling of the Holy Spirit], they would have remained with us [because they would never have abandoned Jesus Christ]. But their departure [those who fell away from the faith, denouncing the very person, Jesus Christ who they once professed to love] made it clear [or exposed themselves to the reality of their spiritual condition to the body of believers] that none of them belonged to us.” -1 John 2:19, BSB
If an atheist ever says to you that he knows more than you, referring to the Bible, or that he once had the Holy Spirit, it just shows how deluded they are and continues to be. Unless they humble themselves in the sight of Christ, they will continue to walk in darkness straight to the multiple pathways to hell. Atheists are one of the proudest people you will ever encounter. The reason for this is that they went through a traumatic situation that got them so bitter towards God that all they can do is curse at Him and His followers. People like that make me feel sorry for them. Only prayer can break their hardness.
Keep the atheists you come across in your prayers for the salvation of their souls.