I was raised Catholic and have 12 years of Catholic school education as well. Although I don't attend church on Sundays regularly these days, it's not because I would be atheist. That I am definitely not, my faith in God and his existence is strong. I simply have a problem with the way the Catholic doctrine denounces my being gay, and among other things like female clergy and the celibacy or marriage of clergy. quote]
I am so much like you. I also was raised a Catholic and for various reasons left the Church. But for the 24 years I was away, I never lost faith in God. Somehow in my youth I came to realize that what people and I disliked so much about the Catholic church was caused by humans, mostly men (priests & teachers) in my case. In my primary school period, we were taught every absurd erroneous things I read above. I agree, said teachings turned a lot of members away from the Church, then and today.
As an outdoors person, I love to hike and camp in the woods and mountains. In nature I found I could not refute the existence of a God.... my God. After that long lapse of time I slowly returned to the Catholic Church but started to question everything I read. Lucky me, I now went to a Catholic University run by the Dominican Fathers. I found more priests/monks there, that thought like me. I spend three years studying many of the points stated above, i.e. the Infallibility of the Popes (which only applies when he speaks Ex Cathedra on dogmas, by the way) not on everything he says. I have studied the new Testament in great depth and yes a lot that was written, was written for people 2000 years ago with the knowledge and mentality of that time. For every priest and teacher who told me I would go to Hell if I did not do or believe something, I found teachers who preached how awful those priest and teachers were. For every one who spoke against homosexuality to me in my life, I found teachers who said if the Church had more compassion and understanding of all christians, few priest would have been allowed to hide their sexual conduct behind/inside the Church.
Many who have left the Catholic church did so with good reasons and they are not to be looked on as anything but Human beings. Unless we have experienced physically or mentally what they experienced, we can only speculate on their decision. I also ask who gave us the mantles of judges. Then I shudder every time I hear that "The Church ( Catholic) is a big ship and slow to turn." If it does not it will run aground and be completely destroyed.
My personal attitude is one of believing in God, participating in my congregation but never hesitating is rejecting what I consider to be erroneous doctrine, from people, priests or agnostic. I have learn to love my fellow humans and walk my walk.
I hope that gives you another point of view.