He's around 10 years old now and I broke the news to him that Santa Claus was not real when he was 7 and he took it rough but got over it. Then when he was 8 I told him that the Easter Bunny was fake too. By age 9 I told him that the tooth fairy didn't exist and I was the one who put money under his pillow. Do you think its time to tell him that God is not real?

Really?? lol man You should let him choose what he thinks on that subject. Why somone would  ask this on a gaming site is beyond me. O wait I get it. To late now. Boo!

Whoa Santa Claus is real!!

He could find out the hard way (educating yourself, curiosity and going through hard times) or you can tell as soon as possible so he doesn't get to attached to the idea. I think it'd be pretty weird for someone to believe in Santa Clause all his life, so this shouldn't be any different.

Just in case anyone missed it, he's comparing the Christian "God" to mythical figures in childrens' stories. I thought it was quite witty. He wants to have another religion debate going.

It's better to have him realize him. Read up on some basic philosophy, and introduce him to the mindset of having to have an actual reason for everything. Ask him and get him to prove why stealing is bad, why we have property rights, government, and then finally work up, why there needs to be a concept of god or not.

Introduce to him the concept of Occam's razor in very simple examples. Perhaps to try to do an altered and mini version of Descartes's Meditations (without the assuming god exists parts, and perfect concept and what not).

Just saying "God doesn't exist" will be an massive shock. You need to make him slowly realize it. And also emphasize the point that he should be living a utilitarian life, not one of striving immortality.

Someone created an alt fearing of the banhammer for bringing up religion and beliefs.

Why should you be the one to make the decision for your son on that?