Me? I was raised Catholic, but in a liberal Chicago Catholic way. It wasn't until I learned about Catholicism in California did I realize that some areas can be more tongue-in-cheek with the rules while others are much more strict adherents. For example, in Chicago the Catholic Church there would think little of it if you married a Jew in a hotel and asked a priest to attend the service. In California, that's impossible -- you even have to get permission from a Cardinal just to have it between Catholics outside of a formal church.
But more to what got me on my drift, I got into philosophy (minored in it) and other world religions in college. And given how different religions are products of their times and the societies in which they thrive, I quickly realized -- at least for me -- how narrow a perspective any one single religion can have.
I do think there are merits in going deep in the narrow path of a single religion. But my interests are more in the breadth and variety and the question of what innately makes so many humans religious.