Islamic Shari'ah law is extracted from both the Qur'an and hadiths. Islamic jurisprudence are expansion of the laws contained within them by Islamic jurists. Therefore, they are seen as the laws of Allah. You need only look to the rulings under Shari'ah to see the accepted mainstream interpretation of Islam and its commandments to its followers. Homo*sexuality under this law, is not only a sin, but a punishable crime against God.
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Countries like North Korea have a much better view on homosexuality. They recognize it as a genetic disposition and accord them rights justly.
If God views the act as a sin, let God deal w/ them who are we to punish people in his name?? I accept judgement from God but not from a bunch of homosapien monkeys :) Societal laws should be based on science and not religion.
Not all religions are against homosexual behavior. Look @ Native American religions or Mayan religions, for example.