I know that many Christians are worried that teaching children about the world religions might confuse them and lead them to question their own faith. I'm sure it will. I hope it will. I'm not convinced that living an unexamined faith has any value for anyone. I feel the same way about atheists, whose worry about religion in the schools is not that different from Christians'.
Faith is faith, whether it is in a god or in no god.
Ultimately we cannot prove either position. What I worry about is blind faith in either position. To cling in fear to what one is taught is to live closed off from the profusion, beauty, and variety of reality. In my mind, it is a form of death. Let children question and search for their own truths.