"Sin is simply the transgression of God's law. If people don't believe that God is the ultimate law giver then a Priest's Minister's or Rabbi's preaching to them is completely pointless anyway."
- Why? If God is all powerful and all knowing, isn't it safe to assume that he is also a rational being? Science is nothing more than a form of reason.
Ya, but...even if there were no health issues active homosexuality would still be sinful.
In the sin you shall bear the punishment - old Spanish proverb. If you think about it, each and every sin carries with it a clear punishment, not in the afterlife, but in this one.