I don't have kids, thank contraception, but I'd tell my kids all about religion - ALL. Not just the "good" stuff the religious love to push, but the massacres, the genocide, the hatred of other groups, the blood sacrifices (and that's just in the bible).
Tell them about it but don't sanitise it.
Tell them about it but don't sanitise it.
Playing Cluedo with my mum while I was at Uni:
"You did WHAT? With WHO? WHERE???"