most people here seem to be suggesting that you teach the kids all religions if you're going to teach them any at all.
The reluctance probably comes from the logical implication, that if there are many different religions, most or all of them necessarily have to be false, since only one (or none) can be true. But if most of them are necessarily wrong, why is "my" religion the only one who is true? And if you evaluate the possible answers to that question, you realize that they can also be applied to other religions, oftentimes even better than to your own.
Teaching children all religions is a pretty good way to make them irreligious.
This tension also lingers in inter-religious relationships.