1. No supposedely all knowing diety has ever imparted any information that the people that believe in it could not possibly have know themselves. Therefore man invented god in his image not the other way around.
2. All gods are local. No god ever appeared to anyone else in another part of the world to the area where it was invented.
3. Apparitions. No one ever had an apparition which was not consistent with their own indoctrination. In other words no muslim child ever sees the virgin mary and no catholic child ever saw mohammed.
4. all gods are illiterate. No god, no matter how powerful, has ever mastered the art of handwriting. All religions claim to have heard a god talking but the god itself has never written anything down apparently having to rely on half baked goat herders as secretarties.
5. All gods have been completely lacking in foresight. A god trying to communicate with its earthlings should at least have the foresight to see how a badly drawn set of instructions would lead to its creatures killing each other.
2. Already stated.
3. Very good.
4. Even better.
5. Funny 'cause it's true.