It was mostly a gradual thing for myself. I was raised Lutheran, going to church on Sundays, Wednesday confirmation classes, vacation bible school in the summer and Catholic church on major holidays when we would visit my mom's family. I was around 14 at one of the Wednesday classes when I asked a question. I don't even remember what the question was. My pastor's wife looked at me with an angry look and said "we don't question god!" That was the beginning. I started studying other religions. I even joined a coven for a bit. But the more I looked into it the more I saw it was all a lie.

Since I was born athiest, I continued to be athiest. Mom sent me to Sunday school to learn about religion, but I never took to it. Religion wasn't a thing we discussed in my family.

I think I knew at about 10, when I had an outburst and said, 'I don't believe in Santa, The Tooth Fairy, God or Jesus'. I got told that I had to believe in God and Jesus, but knew already that there was no logic in it. I knew for certain when I realised at 16 how cruel some people were and that 'God' let them be. No omnipresent being could bear letting innocent people (and animals) suffer like that, it just didn't make sense to me. Plus he created Lucifer/ Satan and so would have known how things would pan out. A silly story really.

When I was 4. I never believed it

I realized my religion wasn’t real when my high school teachers couldn’t keep a consistent doctrine from year to year. Also I hated being forced to do a bunch of stuff and it got me suspicious about why a God who relies on self expression and free will gives burning in hell as an alternative to not following a pretty strict set of rules.

I actually became atheist in high school, but went back and forth through multiple religions. I was raised in a fire and brimstone household, so I always was a bit scared I was wrong. It wasn't till my 30's that I started college and took religion classes that I realised how basically the Christian religion was a Frankenstein of other religions. I guess the truth did set me free.

I had to study theology to become a counselor in Germany. I also studied ancient histories, cults and other religions as a paranormal investigator. The story of Jesus kept popping up under different names.
That's about the time I started doing the math.

We never went to church when I was a kid. Only once or twice. I roamed around an empty church with a friend at the age of maybe 10 or 11 while she told me about all the Catholic rituals and beliefs. It all sounded crazy to me. As a teen, I wanted to go to church and youth group like my friends, and I REALLY tried to make it work, but I just couldn’t buy into it.
So I guess I was never religious to start with.

When I was 16. I stopped being a good little ignorant christian that never attempted to read the bible at this age. Instead of just parroting what the pastor said, I took a look for myself. This is what started sowing my seeds of doubt.

I figured out Santa Clause, Easter bunny, and tooth fairy by the time I was about 7.The good stuff took longer because I thought it had to be real. We, and all my friends went to church and stuff! My agnosticism started around 17. Spent a lot of time studying about god to no avail. Admitted I was an atheist when about 25, and became re-convinced that god was imaginary at 33.

I was reared Catholic and I was inquisitive as a kid, but I received the quelling responses that led me to be a devout teen. I really started questioning again when I was in college, about 19 or 20 years old, and that's when the tapestry started to unravel. A little history about the Catholic Church and some insight into the theology made me realize it was nonsense.

A gradua;l rpgressopm duriong m,y teen years.

It never made much sense from as far back as I can remember. Even from primary school age I questioned all the suffering in the world, why were prayers unanswered, how did the Tower of Babel work, water into wine was a wine making kit etc etc

I can't pinpoint one specific moment, but I feel like I always knew it was all bullshit.
I was raised catholic. I think that tended to speed up the return to atheism more quickly
than perhaps another religion might have.
Catholics are notoriously hypocritical. Then I started to actually read the bible. By the time
I got through it, I was back to being the atheist I was born to be.