I agree totally with the idea that children should be taught about world religions, if only so that they can appreciate much of the great art, music and literature produced in the name of, or inspired by, or in response to, religious belief. It's important to understand where we came from and the different systems of belief, not so much because you can then evaluate the differences between them, but so that you can see the similarities and the needs humankind has had over the past few thousand years and so begin to appreciate our common humanity.