How should i go about teaching religion to my children?

First of all i want to say that i am not planning on having children and this question is purely out of pure interest.

I am an atheist and i want to know if people have any advice about teaching religion to their children. I would want them to chose a religion on their own free will, but i do not think that shielding them from all organized religion is the best approach. I would probably have them go to Sunday school in as children so they have some background in it. Any advice will be ver appreciated.

don’t, religion is for idiots.