As an atheist… am I doomed to some “hell”?

Firstly, I mean to discuss this as respectfully as possible, and I am not attempting to simply critique your religious beliefs.

I’m atheist. I believe I’ve lived thus far as a mainly good person who hasn’t done anything “unforgivable” or even been just a general jerk. But, according to what I’ve heard, not conforming to Christianity (from your point of view” means im damned to eternal suffering? Because I didn’t believe in your God at all?

I’ve also heard that to blaspheme is an unforgivable sin… and as I do not believe in God, is this blasphemy?

Give me some sort of explanation for why a good person who rejects the idea of god rots in hell, yet a serial killer who at the end of their life repents gains access to heaven?

I won’t be swayed on my disbelief in God. Do I just get to suffer eternally?