Since there is no existence of God, the people claiming to be its messengers must be lairs and fake. I believe that all so-called messengers used name of God for their own invested interests. For example He wanted to have sex with child, so he said that God has ordered to do so. He wanted to have a lot of wives, so he claimed that God has allowed him to keep him several wives, and allows his pupil to marry upto 4 girls. He wanted to be a king, and he got thousands of soldiers in name of God.