Where to start? Not all religions try to convert you. For example, Judaism doesn't. You can convert, if you're willing to put in the work, but you have to be persistent since it's discouraged.
Not all religions believe in Hell. Or have a concept like sin. There are even sects of Christianity that don't believe in Hell!
I've studied many religions when trying to figure out my place in the world.
What did you think about Buddhism? Wicca? Neo-paganism?
I'm a Satanist. We don't look down on you for being an atheist, because most of us are atheists, too. We don't believe in Hell or Heaven. We won't try to convert you because we respect your autonomy.
I've never had any other religion treat me the way you've described. Only Christians, and even then, only certain sects of Christians.
I recommend finding a Unitarian Universalist church and attending at least once. They accept anybody: atheist, Christian, Muslim, Buddhist, whatever. I ultimately decided that it wasn't for me, but it was an interesting experience.