People pick and choose both. What I have seen is that people generally start with what their parents taught them, but it's not that uncommon for them to end up

People pick and choose both. What I have seen is that people generally start with what their parents taught them, but it's not that uncommon for them to end up completely different. And it changes over time. I was very much a "D" voter when I was young (as my parents were) but mostly vote "R" now. I've never been religous though (neither were my parents).