I was already having issues with what the church taught about gay people. One of the priests at my college church likened sex before marriage to child sex trafficking, saying premarital sex directly lead to child sex trafficking. I walked out in the middle of the sermon.

I was still on the fence about if I was Catholic or not afterwards, it was all I knew growing up after all. I went to history class that next semester and learned the Bible was just piecemealed together by a bunch of old white men in the ~~16th~~ 4th Century during the council of nicea. There is literally no way to tell who actually wrote the stories in the Bible, much less determine their validity because the stories were put together in a single book hundreds of years after they were written. On top of that, if a story didn't fit what these guys decided the Catholic faith was supposed to be, they threw it out!

The Bible isn't the word of God, it's some dudes in the ~~16th~~ 4th century's head cannon.

That pretty much sealed the deal for me. If there is some divine force, it certainly wasn't going to speak to me through this book or this faith.

Then to add insult to injury, in that same class I learned about the history about how the Christian faith came about, and how they basically just chose one of many Mesopotamian gods and decided he was the one true God and propagandized and crusaded their way into making people accept their beliefs. All of it was just decided and shaped by humans, and none of it was "divine" as I was taught. It was all a lie.