Why dont people call God the Tooth Fairy?

Because God is a different unrelated mythical creature.

Because he's God.  Duh.  

Because he is no fairy, and he doesn't leave money for teeth we lose, silly.

Hold on a moment there, pard.  You're begging the question.  You have not established that there is no God.  Nobody has.  Think again, if you are able.

Every year millions experience him for themselves, quite without imagination.  You should, too.  It's the logical thing to do.  Don't bother moving the goalposts.  It's more evidence than you have to shore up your fantasy that there is no God.

Oh, you poor dear. The tooth fairy is a fiction to soften the stress a child feels at the loss of a tooth.

God is a much, much larger concept that involves a lifelong search,  even for those who believe they have found Him.

It makes a lot more sense to believe in God, the designer,  than to imagine that we are simply the fortuitous result of the random collision of atomic particles. The math doesn't add up.

Thumbs down without a considered response is viewed by all as an admission of ignorance, something the author of this post will freely admit to.

The more I learn, the more I realize I don't know. 

 because gods only exist in twisted religious mindset obviously .

Because there's already a tooth fairy, with copyright.