Without God’s word, ultimate autonomous virtue leads to defending deviant behavior against conscience. That’s where the world lives today. It doesn’t have a good enough reason to condemn sinful practice without being bigoted, so the world defends what God condemns.
Although all men know by nature that homosexuality is sin, it’s only through Scripture that one can adequately defend the claim. (Natural theology types are free to try sometime.)
Since most people are autonomous in their thinking, it’s understandable why most cannot justify with any consistency and without avoiding arbitrariness, the claim that homosexuality is morally wrong.
Although many straight people still find homosexuality unnatural—unnatural does not imply moral deviance. Even the claim that something is unnatural presupposes a network of beliefs about reality, truth, and ethical standards that cannot adequately be justified apart from Scripture. Whether homosexuality is sin is indeed a worldview question.
Sure, in general revelation there is natural law that pronounces guilt for sin upon all mankind, including guilt for homosexuality. Notwithstanding, natural law can grow increasingly dim in the minds of the ungodly. Yet even when natural law was shining more brightly upon social conscience, it was never to be interpreted apart from special revelation. With the rejection of the Bible, mankind is left to grope in darkness but not in search for moral standards – rather for moral standards that are philosophically defensible in the context of a larger worldview context that should be consistent, coherent and explanatory. On the authority of God’s word, we know it cannot successfully be done, which has been corroborated and verified since the time of creation.
Accordingly, two unhappy alternatives:
Apart from viewing homosexuality through the lens of Scripture, one is left with two unhappy alternatives: (i) a bigoted rejection of homosexuality or else (ii) condoning what is known in conscience to be morally deviant. In other words, apart from Scripture one either can judge correctly yet for sinful reasons, or else violate conscience (and live in moral conflict) by condoning in the name of love, no less, that which is an abomination in God’s sight.