The moral conduct prescribed for gays is the same as for straights who are not married to someone of the opposite sex: permanent and absolute sexual abstinence. No one hates gays here, just like no one hates priests, nuns and singles without same sex attraction.
There is, in my opinion, a decisive argument against gay marriage that is not immediately religious: marriage is ordered to procreation. This means that the society has an incentive to protect the institution of traditional marriage, since it is the arrangement that ensures its own perpetuation. Same-sex marriage does not have this attribute, so there is not an obvious motive for society to grant it special protection. I also think that society does not have much of an incentive to encourage polygamy, for instance. While it also tends to protect procreation, it fails to protect security, by at least two mechanisms: i) reducing the genetic pool through reducing the number of fathers; ii) preventing many young males to match with females, which may give rise to potential social problems.
I think all these practices (gay marriage and polygamy) should be left to private arrangements between fully consenting adults, but without the explicit protection of the society through the state.
Ah, and congratulations for the wonderful grace of fathering a second child, extended to your wife!!!