Or rather, why not teach them about religion, they're going to be faced with it sooner or later, why not sooner. Let them see this blind faith and interject with true facts. Let them pray, and let them learn. Maybe this is the best way for them to choose. If you eliminate god from their childhood perhaps this is as bad as forcing him/her into it (childhood I mean!)
From my experience the most intelligent non believers are those who were once believers. Maybe the thing that makes us seem more intelligent is that we use true reasoning, facts and logic as opposed to what is convenient or forced onto us.
The religious are scared of atheism, we say it's because they know their beliefs are flawed. Why are we afraid? Why not LET the children pray, discuss it with them, ask them how they feel, ask them if they like it, talk to them, explain how people get things they want, teach them about actions and consequences affecting life and not prayer, teach them the fallacies. Gradually increase the level of teaching to suit their age- don't you think this is more appropriate than slamming a thick metal bolted door in front of religion?
I'm not saying this as fact, this is me actually saying what do you think. I have no firm thought on this yet so would enjoy listening to some responses

+1
I disagree with compulsory worship, but religious education I believe is a must. It should be compulsory for all children of all faiths to learn about the faith of others. To learn the ins and outs, the history, arguements for and against. To be taught to think for themselves on the subject of religion. This is what our schools lack right now.
You do religious education, but can be excused if your faith does not permit it. You learn about what they believe but are never challenged to argue against these beliefs, and that helps no one.
My son has had to say grace before a meal for 3 years now, because the only school he can attend has compulsory worship involved and we have no other choice.
My son is an atheist though. He just says grace because its part of the rules.
Religion doesn't care if all it has are parrots in its service, just as long as the parrots keep saying polly.