Be that your sincere conviction or your self-serving opinion, I'm not the one who can see into the depths of your conscience. Only you can know that. As for myself I did the whole atheist thing, but I could never kill that feeling that what I was doing was wrong.
I'm not an atheist.
I'm a polytheist.
You're skipping the rest of the point there. Anyone who knows the Church and her role in our salvation, yet obstinately refuses to enter will be damned. But again as always, the degree which any given soul was ignorant of the Church will be for God to determine.
Fine with me. The whole "salvation" thing never made any sense outside the context of "salvation from Roman occupation", and then during the Migration Age after West Rome's Fall, "salvation from these horrible times".
I see great wisdom and applicability in these stories when they're taken as that. Remove the Hand of God from the Christian mythos, and its true wonder comes forth. Adam and Eve is seriously one of my favorite stories from all the World's Lore. I love the idea of the Divine Comedy, and even toyed with the idea of adapting and reworking that imagery and concept into something involving Tiw, who was the Allfather and King of the Ese (Aesir) before Woden claimed those titles during the Migration Age (heck, the very word and name "God" replaced the word and name "Tiw/Tiu/Tyr"). Tiw's domains include honor, law, justice, victory, and single-combat, and He's one of the reasons culture instinctively thinks of "God" as "up/in the sky". He is a Sky Father; i.e., a Heavenly Father. (Heaven used to simply be a synonym for Sky). Historically, Zeus and Jupiter are among His Brothers, and His name is cognate with words like "Deus", "Dia", and Sanskrit "Dyaus Pita".
But here's the thing. I very much agree with Lucifer in Paradise Lost: to reign is worth ambition, though in Hell; better to reign in Hell than to serve in Heaven. (Should be noted that I've not actually
read the bulk of that work, so I don't know if that declaration was refuted, and if so, how). Lucifer is Prometheus, the Titan who loved humanity and would not stand by while the selfish Olympioi would not share Fire. He is Robin Hood, who takes the ill-gotten wealth from the Rich to give back to those from whom it was stolen via the law.
It's not that all outside the Church is utterly devoid of all truth when it comes to God and our relationship with him. It's a scale, and some philosophies certainly hint to more of it than others. But to the degree which pagan philosophical concepts capture some element of truth they nonetheless cannot save us from the inevitable damnation we would all incur without the grace of God, which can only be obtained through Christ.
I don't buy that explanation for the similarities. I find it far more likely that the early church simply adopted many of the pre-Christian traditions and taboos in order to better appeal to the people as a whole.
Modern equivalents might be those various newer religions that pop up now and then that talk about things like "salvation" or an upcoming "end of the world", with a messianic figure at the center. Dead ringers for Christian theology, but they often incorporate elements borrowed from other stuff, such as barely understood Eastern philosophies, alien theologies, New Age practices, etc. They do that because it's a familiar framework that people respond well to.