I think it is very easy to separate religious beliefs from political beliefs on the issue of gay marriage because a religious marriage and civil (state-created) marriage are two separate institutuions. If a couple is not married in the Church, but obtained a civil marriage license, they are not deemedmarried in the eyes of the Church regardless of gender.
There is nothing sacred about state sponsored marriage. It merely confers a legal status on a couple, and provides rights, privileges, responsibilities and benefits under the law.
A marriage within the confines of the couple's religion is a sacred bond, and if the religion defines marriage as a union between one man and one woman (or several women), that is fine.
Even if one throws out all religious arguments completely, state sanctioning of gay marriage basically sends the message that men and women are no different. That the union of a man and a woman is no different than two men or two women. And that, to put it mildly, is a load of crap.
