People can be born defective (e.g. Tom Cruise, John Travolta, Rosie O'Donnell, Lady Gaga, etc.). That does not make homosexuality righteous.

Homosexuality is: forbidden (Lev. 18:22), considered an abomination (1 Kin. 14:24), punishment for (Lev. 20:13), unclean (Rom. 1:24, 26, 27).

If it was proven that homosexuality was genetic, would it then make it okay?