Being gay isn't a sin.....and if your going to bring the OT into play......then wow....we might be here a while
Homosexuality is a sin, this is not just detailed in the Old Testament but also the New Testament.
Furthermore, Jesus promotes real marriage
Matthew 19:1-6
19 And it came to pass, that when Jesus had finished these sayings, he departed from Galilee, and came into the coasts of Judaea beyond Jordan;
[SUP]2 [/SUP]And great multitudes followed him; and he healed them there.
[SUP]3 [/SUP]The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause?
[SUP]4 [/SUP]And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
[SUP]5 [/SUP]And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
[SUP]6 [/SUP]Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
Anything deviating from marriage is called fornication. Homosexuality is a form of fornication, same as adultery, beastiality, etc.