The only thing you can do is teach your kids about your own beliefs, that's part of being a good parent. When they get old enough to understnad these things, of course they will question, and then they will make up their mind, that's the way it has worked for hundredds of years. My parents brought me to Church, my father is quite the religious type, but neither of them ever shoved anything down my throat. They taught me what they thought was right, and once I was old enough to think about these thingfs for myself, I made my own decision.

I guess I'm trying to say that if children grow up completly atheist, then they wil never have an opportunity to think about spiritual matters, because they never learned how to. Children that grow up within even the smallest and slightest of religious frameworks can formulate their own ideas spiritually much more easily, even if it completely different from the religion they grew up with.