Martin Luther was in the same exact spot, he was a Catholic monk, and one day he found the bible in the library of his monastery, he read it and started to see that the church was not as holy as they claimed to be. Have you ever read the bible? If the answer is yes I suspect it as a while ago, you should re read it. If the answer is no, PLEASE read it before making decisions, the only way to know God and to see for yourself if he's real or not, is through his word! And when you read it, don't look at it as A book, look at it as THE books, it was written by many writers and sometimes it might feel contradictory, but if yourself study it, you'll find that everything makes sense, and it explains itself, I can even recommend you a Bible if you wish, it helps a lot to have a bible designed and made for study, the traditional Bibles without explanation and comments on the sides and bottoms are hard to read and understand. Wish you the best and God Bless!