That's it! Religion is the creation of man. Only fools will believe that their religion is the very word of God. What is surprising is that in this 21st century of scientific enlightenment, even educated people believe that their religion is directly from God!
Cultists such as Branch Davidians, Jonestowners, Heaven's Gate and so on believe that their leader is/was a prophet and their teachings came directly from God's inspiration. If these characters were there in there 1400 years ago, there will now be millions of their followers all over the earth claiming their "religion" is the only true religion directly from God!
I hope every dogmatic religionists, especially the Muslims, think about it and contemplate on it. One cannot logically claim that some old book was written by God or his direct agent. That is utterly foolish. Once we accept religions are man-made, the dogmatism will immediately vanish.