Religion (n.) The means by which a generally logical mind survives in a world with an over-abundance of unknowns.
Religion is an intellectual's escape: the fool has no need of it, and foot soldiers of churches everywhere follow for reasons other than belief. Mr Spock is more likely to believe in a god than Crewman Nr.5, who follows Captain Kirk because he thinks it's a good way to get cute alien chicks.
Society has evolved alternatives to religion, primarily alcohol and in some cases, sex. Organized religions therefore insist on banning (through the sancity of marriage) sex, and (by force if needed), alcohol.