Sin is personal separation from God,
No, that's a consequence of sin, not a sin in itself, and since Adam and Eve's original disobedience we're all supposedly tarred with that brush, regardless of anything else we might do in this life, the greatest of good works will not save us. I think that's an evil idea.
Here's what it looks like to me: There was a magic tree whose fruit was forbidden, there was a talking serpent who duped a gullible woman into eating the fruit, then she duped her equally gullible partner (though she paid much the greater price for it), and as a result we are all cursed with original sin, which I think we could fairly describe as an evil spell on our souls. Then along comes a guy who was executed as a scapegoat, the fall guy, for everything we've ever done and ever will do wrong, but he gets reanimated by a supernatural force and promises eternal life and removal of the spell if we accept him as lord and master, believe the right things, and follow the proper rituals.
That is the core claim of Christianity, stripped of its mysticism and specious niceties, and it sounds like a fairytale to me, at best. At worst I think it's a frightening and wicked thing to tell people, especially children, that they are doomed for all time unless they accept this stuff. I know a lot of Christians, some of them pretty serious about it, and I respect them as people for the most part, they're generally good and decent folks, but that belief system I think is just false, it flies in the face of everything I understand about the way reality actually is. I know of no good evidence that suggests any of it's true and plenty that strongly suggests it's not.
The burden of evidence and proof is on the people making the claims, such as you. All you've done so far, in any of your threads, is make assertions without evidence, mostly just with biblical citations, and as Christopher Hitchens tartly observed, what can be asserted without evidence can be dismissed without evidence. Or to cite another of my favourite philosophers, George Carlin, religion is the all time champion of false promises and exaggerated claims. And really, it's worse than that. If this deity has the characteristics usually ascribed to him, he knew what was going to happen in the Garden, that his creations were flawed and would disobey, but rather than creating us as better creatures more to his liking we are commanded to heal ourselves or be condemned for all time, and he hides it behind an illusion of free will: we are free to choose, but if we make the wrong choice, it's an eternity of conscious torment in fire for us. That's a choice? Nope, that's bullshit.