It is usually argued that we need religion in order to get humanity to behave and work together. All evidence is to the contrary. Religion has not notably improved human behavior. The pagan Romans were far kinder than the Inquisition Christians. Nor has religion united Christians, Muslims, Buddhists, or Jews. It has divided them. In fact, religion will never unite them, because religion requires that they share the same beliefs, without offering any reliable evidence that their ideas are correct. Reason, on the other hand, is the only thing that can unite people of diverse opinions. Reason bases its decisions on evidence available to everyone, and allows people to disagree when evidence is lacking. Religion will never do that.