But it is not the "entire religious world" that objects. It is the most powerful, organized, and most vocal among them. There are Christian and Jewish churches that support gender equality in marriage, and some that would perform the ceremony if it came with a valid license from the state. How does (and I know I'm not supposed to here, sorry Mani) this preference for the wants of powerful church lobbies not fly in the face of establishment?
It's not the entire religous world that objects, I agree. Opposition to marriage equality comes from the LDS in Utah, the RCC, Family Research Council, Focus on the Family, Coral Ridge Ministeries, and a number of other 'megachurches'.