Are you seriously coming into this thread to try to convince Christians not to believe what we believe? Why? What do you care if we believe homosexuality is a sin? Are we marching to have it outlawed, or do we simply state our beliefs, cite Scripture as its basis, and go on with our normal, unobtrusive lives? God gave us all free will. You can believe or not as you see fit, and all any of us will ever do is attempt to show you the Light. Not through coercion or force of law, but by simply telling you. You can even put your free will to work by ignoring every word we say. Instead, you try to trap us in some inconsistency uttered, not by the person you attempt to set the trap for, but by someone else who may or may not understand whatever grunt said that they were commenting on. To what end do you employ such dubious tactics?
The Old Testament wasn't made obsolete by the birth of Christ, it was clarified, added to, and prophesies were validated by His arrival. It's not an either/or proposition. What do you achieve by trying to make it such?