I'm against gay marriage on religious grounds and I'm nowhere near what you would call a bigot. Even without the religious grounds I would oppose it on scientific and natural law grounds.
Unless you are Jewish and only read the OT I am not getting how your faith can make you opposed to gay marriage. The 2 times homosexuality are mentioned in the NT they are talking about just going out and having copious amounts of sex with just anybody, but it doesn't say anything about loving relationships.
The majority of Jews ignore the law of Moses. Some Jews are even athiests.