I posit, that while religions foment for the existence of God, the mere existence of religions is pretty conclusive evidence for the existence not of God, but of Satan. Traditionally, it is Satan's overriding desire to spread pain, evil, suffering, disharmony, etc. among mankind. What better way to achieve his desires than to create religion. Religions assures that various groups of humans will be constantly struggling to eliminate each other. It does not allow for compromise, how can one do other than what their God demands? It cannot tolerate anyone engaging in "sin", though one sect's sin is another sect's sacrament. Religion, in other words assures that humans will engage in endless conflict, inflicting anguish and misery on any and all for as long as religions exist. And, since no two people ever agree about all of the interpretations of their sacred texts, when there is but one religion left, they will fight to the death to eliminate the heretics among them.