Once again, it’s unfortunate for the believer that the Bible says the same thing about homosexuality that it does about polyester blends and putting cheese on your burger: It’s against the Law, corrupts you, and makes you unclean. Still, Christians persist on attempting to outlaw unions between two homosexuals, but not meat and cheese, or cotton and polyester.
Because it’s easier to pick and choose what you want to reject – it’s even easier when society makes it permissible to bully and condemn people that aren’t within the accepted status quo. Furthermore, the few verses that actually discuss homosexuality and condemn it apply directly to the nation of Israel. The Laws of the Old Testament were never intended to be followed by anyone who wasn’t a Jew. These were G-d’s laws for G-d’s people. Likewise, as Christians in the New Testament weren’t people with any sort of power over the political system, they had no ability nor intent to control the morality of others – unless, of course, it was through converting them. The New Testament Christians and the Early Church’s only prerogative in having any control over morality was inside the Church itself. They disciplined one another, but never anyone who didn’t adhere to their belief system.
An excerpt from: http://ragingrev.com/2013/01/when-christian-ethics-arent-christian-ethics/