marriage is more treated as an institution here in the US, i would be against gays marrying if it were based wholly on religion, but for the entirety of the life of the US, we have always had seperation of church and state, so as LONG as the GOVERNMENT is issuing marriage 'licenses', anyone who wishes to get married, same sex or opposite sex, should be allowed to.
Divorce laws need to be established first before gays get married.. the issue of the children would be a BIG issue if gay people got married.. other than that if getting married makes them happy then go for it