Sorry, John Mac, but the Old Testament is germane. Anti-gay Christian hypocrites—and not all Christians are anti-gay; not all Christians are hypocrites—are constantly citing passages in the Old Testament to justify the persecution of LGBT people. We are far likelier to hear about Leviticus 20:13 and Sodom & Gomorrah in an anti-gay sermon than we are to hear about Corinthians or Timothy. And when conservative Christians toss Leviticus 20:13 in our faces—or get it tattooed on themselves (in violation of Leviticus 19:28)—we have a right to confront them about everything in the Old Testament that they choose to ignore, from the "abomination" of eating of shellfish to God giving dads the okay to sell their daughters into slavery. ("Adam and Eve, not Adam and Steve" is a popular an Old Testament reference too.)
But it's only when gay people bring up a passage like Deuteronomy 22:20-21 that you hear anyone say, "Oh, that stuff about stoning daughters to death on their wedding nights if they're not virgins is in the Old Testament, you goof! That's not in the New Testament!" If it's out-of-bounds—totally not kosher—for gay people to bring up what the Old Testament says about clams and farming and personal grooming and tattoos and menstruation and virginity and adultery, then it shouldn't be kosher for conservative Christians to bring up Leviticus and Sodom & Gomorrah. Which they do. Constantly. And it's not like they have to: there are, courtesy of Paul, plenty of anti-gay verses in the New Testament. But those verses aren't anywhere near as hateful or murderous as what you'll find in Leviticus, of course, which is why they're nowhere near as popular with anti-gay bigots who call themselves Christians.
And now here we are. They say they're fighting to defend marriage from the gays. They would also like to see us dead. Because Jesus. And remember, LGBT people: we must be unerringly polite at all times to "people of faith" who run around claiming we're sick and sinful and perverse and a threat to the survival of humanity and who call for our deaths. Because Jesus.