It was more the practice and the Church that I found hypocritical. About the practice, I guess it's the same on every religion, people claim things and pray, but behave unaccordingly, that is what stroke me as a teenager. I was always wondering: have they just listened to the scriptures read by the priest? So I started to think that the style had taken over the content. As for the Church, its hierarchical functionning, silence in front of repetitive child abuse, the questionable legitimacy of the pope throughout history, the appropriation of the relationship with God (through indulgences then confession), among other things... The doctrine itself is in my opinion very reductive when defining God, at least in its popular version, by opposition to the thoughts of Meister Eckhart for instance. Are you a Catholic?