Well, there ARE different forms of atheism, I'll not deny. I went through all three.
As a baby, I didn't believe in any gods.
As a child, I believed in the Christian god.
As a teen, I didn't, because I thought people's conclusions were dumb* (rebellion more than anything else).
Then, I decided to give the idea a second chance.
Abandoned it as an adult, due to skepticism regarding the evidence Christians put forwards. Since then, I'm 'more' atheist because I don't think the idea makes philosophical sense (1 Corinthians 13:11)
I used to kind of hedge my behaviours in some type of Pascal's Wager variant. Now, I act like there's no God, which matches my professed beliefs.
Now, I'm 'atheist' regarding many gods, I've never seriously considered Thor, or Odin or Vishnu. I just generally don't believe in the same way you currently don't believe that I'm an elephant who typed this post with my trunk - it had never occurred to you to consider it, much less reject it. The Abrahamic God, I don't believe in, since I think there's insufficient evidence for the various feats we were told He did. Considered and rejected.
*In my defense, my family's church was crazy fundy