How did u become an atheist?

[Amarok]

Was always an atheist my parents were both hardcore  Catholics( thou Dad lost his faith). But me and my siblings (all 8 of them ) never caught on despite tons of church . Never had bad experience though  church was fun . Eventually converted for five years to Protestantism didn't stick so I gave it up. and that's all really.

[Angrboda]

I was raised Presbytarian, but by my teen years I'd lost the faith and become a naive atheist. When I was 17 I converted to Taoism. Somewhere between then and last year I gradually adopted Hinduism as my world view. But I was not particularly well read. So I faced a choice of becoming a better Hindu by reading the legends, or become an atheist. Both paths seemed to demand that I use reason to navigate the appropriate choices, so I clove to reason and abandoned my intuitively arrived at Hindu beliefs.

[c172]

I was born an atheist like everybody duh. My mother was on her own with parenting me for quite a while (my biological father had a stroke in '82, and died in '90. Agent Orange.). So, I was sent off first to a babysitting family that attended a Christian church that met in a YMCA. No clue what denomination, or whether YMCA is a denomination. But a few years later, they were fired, because to my mother, I kept coming home with weird ideas (she was raised Episcopalian. Now she just sees "God" in a colorful sunset, a child's laugh, a smile of an old man, etc). 

So, at some point past that, I was hooked up with a babysitter who happpened to be Unitarian Universalist. I LOVED church thenceforth, for about 13 years. Toward the end of that time, though, I think my politics started shifting rightward a bit, and the UU church gradually no longer felt comfortable. In 2006, 21 years after becoming a UU in the first place, my father and I went to Pizza Hut on a snowy Pennsylvania day. After a conversation over dinner, I suddenly understood nothingness, and admitted to myself that I do not believe, and there is no shame in that. Church is not for me.

[Whateverist]

Okay, I'll come clean. When I was 11 I was abducted by a car full of rough looking, drugged out atheists. I was taken to a secluded location and beaten and brain washed until I began to identify with my captors. Eventually I was allowed to return home where I managed to fit in perfectly .. except now I was no longer a believer. Now I am an avowed member of the sodomite horde and take part most weekends on abducting and 'deprogramming' the youth of believers. One by one we are doing the good work of the dark lord of chaos. No joke.

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Umm .. haha .. j/k.

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[The Valkyrie]

Okay, I'll come clean.  When I was 11 I was abducted by a car full of rough looking, drugged out atheists.  I was taken to a secluded location and beaten and brain washed until I began to identify with my captors.  Eventually I was allowed to return home where I managed to fit in perfectly .. except now I was no longer a believer.  Now I am an avowed member of the sodomite horde and take part most weekends on abducting and 'deprogramming' the youth of believers.  One by one we are doing the good work of the dark lord of chaos.  No joke.

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Umm .. haha .. j/k.

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I call those "Tuesday".

[SuperSentient]

I was raised Christian and went to church regularly, one that had stricter principles than many (No TV, some wore head coverings, met and worshiped at other peoples homes, sheltered from the world, large families, etc.). You generally weren't allowed to marry outside of the church and sex outside of marriage was an abomination. The pastor and members of the church knew each other and visited each other for religious reasons in many cases. I was even told the earth was 6000 years old and that evolution was bogus, and I was told that evolution tells us humans evolved from monkeys and I personally pictured a monkey turning into a human one day and knew that was absurd (misunderstandings can have a huge impact on your beliefs).
One day, I joined a chat app and was chatting with someone that happened to be a Muslim, I was sheltered from knowing much about other religions, so I had a very faint idea on what Islam even was. We talked about God and heaven and I was surprised on the similarity of our faith, we both believed in one God, heaven and hell as a destination, held to similar principles, etc. However, I found out later that Muslims were not saved in Christianity. I also figured out that Muslims believed that Christians are not saved either and will burn in hell. It started to get me thinking the abomination of all abominations in religion: What if my religion is mistaken? I thought about other religions too, and didn't find it inconceivable to think that maybe, just maybe I was born to the wrong religion. I mean, there are hundreds of religions in this world, and they are contradictory (can't all be objectively true). Christianity could very well be one of those false religions. I started to look into defense of Christianity and apologetics. I came across the God debate and atheism and was pretty threatened by the possibility that there is no God, but kept looking at the cases here, including the case for Islam. I critically examined my own faith through this long process. Eventually, after watching many debates (atheist-christian and christian-Muslim debates), I came to a conclusion that the case for atheism and naturalism is not as strong as it may seem and Christianity has a very powerful case, as opposed to some other religions. I remained in my faith and stopped looking into the religion and Christianity debate for a little while. So, Christianity won my scrutiny. 

About a year later, I somehow got sucked back into the God and religion debate again and started considering atheism even more. I decided to push theism to even more criticism than before. I looked into the atheological case against theism. To my surprise, the mainstream atheists I watched before only went to a certain level of criticism, but there was a higher and more convincing level of criticism I wasn't familiar with. A good example of this would be the moral argument, I took it for granted the morality was objective, and thought most reasonable atheists would agree, but also thought without a God, objective morality was impossible, so atheists are deluding themselves.  However, when I started joining forums, I heard people claim that they believed morality was subjective. I thought about it and found no reason to think morality was actually objective. Someone who claimed that morality was subjective had set up a thread on morality and not one person succeeded in demonstrating that morality was objective, it was an embarrassment for my view, I had no justification other than that I think God exists and therefore objective morality follows. Eventually, I looked at the criticism of arguments and found that the arguments for God I previously advocated for had collapsed before me, there was more to criticism of these arguments than I thought and found no good reason to conclude that God conclusively exists.
From that, Christianity was dead, you need God and Jesus for Christianity to be worthwhile, but there are no good reasons to accept God's existence and no convincing arguments, so why remain a Christian? Other religions have their claims, but they have had no impact on skeptical thinking and science. We got biological evolution, physics, natural explanations, etc. I also had read Bart Ehrman and heard about the lack of historical support for many parts of the bible, including the gospels. A better conclusion to make was that Jesus was a reformist leader that believed the world coming to a near end. Putting the bible into context removes what I previously thought to be biblical miracles. The rational conclusion here is that the bible and Jesus were nothing divine and special. I concluded that Atheism is the most rational position to take regarding religion. I would remain that way unless it can be successfully demonstrated that a deity defined by a theist exists. Atheism had won.
To this day, I remain interested in the God debate, and consider myself a critic of theism. 

Note: I also have previously thought of atheists in the same way atheists think of religious people, that is, they are betraying their intellect in that specific area of belief. I thought of lacking a belief in God and naturalism as unreasonable and pure fantasy. To me, saying that God is a plain made up fairy tail was like saying that the world around me is pure generated thoughts by a lab scientist wiring a brain to think it is a person of its own.

[Seraphina]

I was raised Catholic but the atheist seed was planted while I was waiting in a bookstore to meet someone I met online. While waiting, I picked up the book "Infidel" by Ayaan Hirsi Ali and decided to buy it.

The date was excruciatingly bad but at least I left the bookstore with a good book. The foreword is by Christopher Hitchens and that was the first time I heard of him. It sent me down a rabbit hole and I read some of his books...and after thinking that if Ali could stand up to religious zealots even after a death threat against her was stabbed into a murdered man's body - I don't have much to fear either- and here I am.

[SuperSentient]

Like every other human I was born an atheist. 

Not this one, he was born a Muslim: https://www.youtube.com/watch?v=HS06i6r2Ca8

[The Industrial Atheist]

More or less I got tired of feeling guilty about breaking rules which cannot be followed. At about that time I thought I'd give Richard Dawkin's The God Delusion a listen.
(it was available as an audiobook on my area's online library).

Also realizing that I had few if any real friends my own age from a Church I spent nearly two decades at played a role even if an emotional one.

[ignoramus]

Because Beccs only has sex with atheists.....

(yeah, still waiting my turn)