My parents were regular churchgoers. The church we attended had a Sunday school for members of the congregation who were under - I don't know exactly 12 or 14 maybe.
One day, I was in this Sunday school when I had what I can only describe as an inverse damascene revelation! Like a beam of light shining through a stained glass window, I realised the the Christianity about which I was being taught was a complete sham; a bare faced lie from beginning to end!
Later on that day, I plucked up the courage to tell my parents what I had experienced and that I had no interest whatsoever in ever attending church again. My father, ever the conservative dickwit, was horrified but my mother took my side and said that if that's really how I felt I should not be forced into going to church in future and despite all my father's efforts to dissuade her she stood absolutely steadfast in that position and I never attended church with them ever again.