Gay Marriage

Against gay marriage?

Then don't have one.

Could anything be more obvious?

Seriously, if you consider marriage to be a sacred institution before God, then the government has no business dictating who can participate in it; that should be up to the individuals and/or their religious community. Or if you consider marriage to be a civil recognition of a personal relationship, then limiting it to couples based on their genders is inequal treatment. The government simply has no right to deny consenting adults the right to marry.