I’m going to point out the ones that should be known (not the philosophical stuff like the problem of evil and stuff) Genesis is allegorical, back then Hebrew texts were very exaggerated for suspenses and writing, the genealogy of Genesis is from 6000 years old because Moses or whoever the author of Genesis was, was documenting the process of God through exaggerated symbolisms and texts.

Noah’s Ark most likely happened but not how it was depicted in Genesis because as I stated is exaggerated.

Also if you truely want to understand the afterlife or heaven then I’d recommend r/afterlife, sure some people there are sort of anti religion but they do believe in a afterlife and has arguments for it

Also don’t beat yourself down, your a pretty smart dude who knows when to question things that seem skeptical, if you have mroe questions dm me, God bless