"the religion you were raised with as a kid continues to bother you even after you've left it"

Yes, that exactly. I mean, I'm still capable of, say, listening to Christian rock; it's just, as soon as I'm aware that it is Christian rock, I have to change the channel lickety-split and pretend I wasn't listening to it, and especially that I wasn't getting anything from it.

Anyway, for basically that reason, I can understand why it would be hard for a Lapsed Catholic to get into any other sect of Christianity, regardless of how liberal it is.