What about the neglected gay right - the right to change. It should nevertheless continue to speak against other sexual sins as well. The message of the gospel is that Christ died for sinners but he also calls sinners to repentance. See my essay on Jesus attitude to sexual sinners. Therefore what God has joined together, let man not separate.
Most people only discover their sexual orientation in their teens.
There is no proof that it is genetic. Even if this were the case it does not excuse homosexual behavior, it is still sin according to the bible. Even for the heterosexual who is born that way the only permissible sexual relations are within marriage. The alternative is celibacy, both Jesus and Paul were celibate. The argument that because 'it is natural then its OK' may be accepted by society but it is not biblical.