Our approach to religion is similar to raising Toddler in Chief as a vegetarian. For now, he eats what we eat because he isn't big enough to make informed culinary decisions. When TIC's older and understands where meat comes from, he's free to eat meat, if he wants to. Same goes for religion. If TIC wants to explore religion when he's older, then he's free to do that.
21stCenturyMom gave her kids the freedom to make their own choices about religion. Now she feels guilty because she didn't provide a bigger foundation to build their beliefs on. But you can't expose your kids to everything.
Just because I don't take TIC to music class doesn't mean he won't be musical or love music. Same goes for art, gymnastics, swimming, and religion. The list goes on and on. I can't expose him to everything. Even so, TIC will be interested in things that I'm not. And I will be interested in things that he rejects. That's sort of how it goes. But he will have the freedom to explore life, the world, and his beliefs, which will ultimately shape his opinions. Isn't that what we're aiming for as parents?