I went to church for decades, and gave what I could. There was an annual tithing, although I could never tithe. I had three hungry mouths to feed, and we did the best we could, but were always on the wrong side of the financial bell curve. I never experienced any of the pressure several of you have mentioned. My churches would have been aggrieved to hear of others behaving like this. Still, that is not why I left.
Along the way, I returned to college, and took many classes that exposed me to religions that I had never studied before. I met people from different cultures, and we exchanged ideas as a matter of social interaction, and occasionally by assignment. I couldn't help but embrace things that worked for them, even if it was to say, okay, we do not all have to think the same.
It was also when I started to study Gandhi, Martin Luther King, Jr., and Nelson Mandela, to name a few. Very different philosophies, but a common thread among them was a demand for an end to oppression. I am innately non-violent, so struggled a bit with Nelson Mandela. Yet, I couldn't help but understand that not everyone was me, and crazy amounts of injustice push people to revolt. The most important thing I took away from it was that I could be who I was, and embrace non-violence. I could also understand that there were people striving for justice who would not do it my way. We could be different, and all be okay.
This is also when I got a chance to investigate Buddhism a bit. The idea that greed is the root of all suffering, and that much of our anxiety revolves around impermanence struck a chord with me. If I had to pick a religion to follow at this point in my life, it would probably be Buddhism, but I don't choose to attach myself to anything, because I have to follow the part inside of me that knows right from wrong. I choose to never be told I have to think one way or the other again.