But I'm saying that God does not exist, so saying that God says I shouldn't say that he doesn't exist, that's just a circular argument.

I could just as easily say that a big dragon created the world, and that this big dragon says you will burn in hell if you say that God created the world rather than the big dragon.

The Bible was written by humans, not by God.

You only believe your particularly mythology because your particular mythology says you should believe it.