Satanist.

Raised Mormon, was a Mormon missionary. Had a nervous breakdown, and religious leaders said that I must be sinning, and needed to pray more, read my scriptures more, and repent. But... What sin? And how was I supposed to pray/study more when I had already dedicated two years of my life to preaching? E.g., there's 24 hours in the day, and I'm already spending multiple hours doing that stuff, so where am I supposed to fit that in?

That was the first crack in the foundation. Took a while, but once you realize that religious leaders are just men (and yes, it's always men in the Mormon church), and that despite their claims they don't have any prophetic powers, then you start questioning a lit of things, like how you can even know truth. (Spoiler: you can't know truth without some kind of objective evidence, and all religions' truth claims are based on subjective evidence and "see?, it says so, right here in my book!")

Atheist is a label that says what you don't believe. Satanist is a label that says what I do believe. So I eventually settled on Satanist.