Normally I would stay far away from such topics on a discussion forum, especially one on Paizo. The only reason why I'm responding is to counter the argument that the Bible does not condemn homosexuality. I don't think an argument can be made that homosexuality is not a sin according to the Bible.
While there is a difference between the moral law and the ceremonial laws of the Old Testament, the former transcending all of redemptive history, and the latter being fulfilled in Jesus Christ and thus no longer required, the declaration of homosexuality being an abomination in the sight of the Lord (Lev. 18:22) is that of a moral declaration which continues today.
The idea that one who believes someone's behavior is sinful to God makes them "phobic" is absurd. It would mean that Christians are "sinnerphobic," which means that Christians are afraid of people who sin, and therefore, are afraid of themselves. I guess in some sense that's true. If we are honest with ourselves as fallen humanity, we recognize that we are capable of some pretty evil things.
Since words do not seem to mean anything these days, then I suppose if we're going to simply redefine what a phobia is, then I guess not much can be said about it. A phobia is an irrational fear of something. I don't fear homosexuals. I think that, like those who covet or overeat, they are sinning against God, and I'm the worst sinner I know, because I know myself better than anyone else and how much I fall short of God's standard.
I guess since people are intolerant of Christian beliefs, and are afraid of Christian morality being taught, that would then make them "Christiaphobic," and bigots against Christians?
I won't deny that homosexuality seems to be singled out among the many sins condemned in the Bible, and in a lot of ways that is unfortunate. I think the government getting involved in marriage at all can cause a variety of problems that lead me to conclude that marriage should not be sanctioned by the gov't at all. I don't think it was intended that way by the Founders in the first place. Marriage licenses as we know them today did not come about until after the civil war. Marriage is a biblical concept, and it is something that should be handled and dealt with by the church. I mean, who is the government to declare what a proper marriage is? That, to me, is God's business, and I think it might be a slippery slope to allowing the government to further intrude into our lives than is necessary.
I think Christian beliefs are attacked because of their public involvement in the politics involved with a federal marriage amendment. I think this wouldn't be an issue as much if marriage became a private matter between families and dealt with by the church.