All you can do with children is raise them with the beliefs you follow and then send them out into the world with all of the information they've learned throughout the years. If they decide to follow another religion, then its up to them to do so.

I had a friend who was absolutely appaled that her Catholic daughter converted to Judiasm. It wasn't the daughter converted... it was the fact that the the daughter had no problem putting aside the emotional attachment and feelings of Mary, Jesus... the whole New Testament. She couldn't understand why the daughter embraced the new religion without feeling tossed around logically.

Think about it: many of us define our lives through our religion whether or not we are consciously aware of it. I love Hydrengas (sp?) because they remind me of 2nd grade when we had the May procession and the beautiful wreath of flowers around Mary's head... how can I tie that memory and the tenderness and reverence I felt/feel for Mary when I'm changing religions to the belief that she did not exist? Thats a bit hard... and thats what the mother was upset and concerned about. I'd never be able to switch because of that emotional attachment. Did I make myself clear? I hope so.