I haven't read previose posts

I would suggest you read the Da Vinci Code by dan brown(yes the movie one), it gives reader alot of information in the direction of the true origins of current and past religions. Give them the facts and opinions from all sides as you learn them yourself and let them decide which religion(or lack ther of) reflect what they feel. Teach your kid well and give them a buffet of choices to suit their needs.

ETA
As I read through the book I google as I go and evaluate the credibility and addition information out there that I read about.