Let's see:
14 years of Catholic education, which included two years of preschool/kindergarten. Mix that with one strictly religous, very pre-Vatican II believing father who insisted the earlier one attended mass, the more religious you were
The same father insisted on the celebrant for my wedding mass, who had been assistant pastor at two churches we'd attended growing up (and a man I couldn't stand.) Turns out my instincts were right, because this priest was the same guy hit with dozens of sexual abuse/assault claims and almost single handedly brought down the Archdiocese of Louisville due to the number of lawsuits filed just against him.
Toss in my own deep beliefs that some of the Church's doctrines and "right ways" (thanks ZTA1806!) and top it all off with relatives who insisted that we'd all go to hell if we followed my father's own burial wishes by not having a full-blown Catholic funeral mass with the associated visitations and wakes, etc and that was more than enough for me.
These days, I'm what they term a "non-practicing Catholic" and do not participate in any formal religion.