I'm a Christian and raising DS as such, but we're open about other religions. I like finding out what others believe and why and hope that DS will grow up as accepting and interested - while I don't push my faith on anyone else, I let them know what I believe and will discuss why respectfully, I will also leap at the chance to find out why others believe what they do.

Teach your DD how to ask questions respectfully and that will be a huge head-start. If she asks "why does that man wear that on his head?" or "why is that woman in that dress?" and you don't know then admit it and see if your daughter will ask the other person nicely - "excuse me, would you mind telling me why you're doing that please?" I'd be happy to answer that and, IMO, anyone who follows the teachings of their faith should be - I think every faith requires us to admit to it and talk about it and I can't think of any faith that tells us to be rude to the honest enquiries of small children (or adults, but some people are ruder to adults than children).