False theological premise posited on Reddit forum: “All people were an atheist at some point in their life. If atheists weren’t able to go to heaven, at what point in becoming a Christian would they be able to go to heaven?”

Christian response,

There exists no such entity as “atheism” as every human being possessing at least a modicum of cognitive acuity and self-awareness intuitively knows that a Creator exists. Now, they may not know our Creator’s Name or what He has done for mankind or His plan and purposes for Life and Eternity – but – every member of human kind intuitively knows a Creator exists through the presence of Nature and what He has placed before our eyes as evidence for His reality (Romans 1:18-32).

The Holy Spirit, working through the Apostle Paul in the Epistle to the Romans, Chapter 1, vs. 18-32, clearly articulates the knowledge of God infused within every individual and the Holy Spirit exclaims that anyone who denies the reality of our Creator is a liar, a “fool,” “without excuse.” With that said, your suggestion that everyone is, at some point in their life, an atheist is simply not factual. In my own life, there was never a time that I denied the necessity for a Creator. Even from my earliest memories as a child, a clear night’s sky provided abundant evidence for design and the necessity for a Designer. I agree with the Holy Spirit that only a “fool” could deny the absolute necessity for a Creator (Psalm 14:1).

Atheism is a demonically based scam, a ruse, for those men and women seeking to dampen a guilty and beleaguered conscience as they, in their rejection of truth, have made themselves Satan’s fool and serve him in the aberrant lust of their flesh, in their sexual perversion, in their abortions, in their ignorance seeking communism as a worldview; these are the enemies of man’s soul and a Nation’s longevity. Do not be deceived by Satan and his facade of atheism as atheism is just another tactic in his quiver to soothe the conscience of man as Satan methodically walks them to the Portal to Hell in their arrogance, vulgarity, pride, foolishness, belligerence.

Mankind turns from the deception and lies of atheism to Truth only by humbling them self before God the Father, repenting of sin and sincerely believing in their heart, confessing with their mouth that Jesus Christ is God who died to pay the sin-debt of mankind and that He was resurrected from the dead for our justification leading to eternal life with God the Father (Romans 10:9-10). This is the point, making this confession with a heart that sincerely believes, where an “atheist” transitions from death to life. Jesus Christ as Lord is the ONLY Way to life in God’s Kingdom (John 14:6).