Reasoning showing homosexuality is evil.

[Mystic]

The very reason why we have a debate about whether it is a choice or not, shows, most humans would not have a shadow of a doubt that is evil if free-will is involved.

This is false.

The reason why there is a debate is purely because there's two opposing claims.  The debate is whether or not sexuality is a choice.

No, it would have been more on the lines "it is not wrong if there is free-will or not free-will involved for certain, so why does it matter if free-will is involved in choice or not" and if people really felt strongly that if it is done by free-will as a factor, then it would not be evil, people would not care for the free-will factor at all. 

The very fact they resort to making it an exception to free-will, shows they know it is wrong if free-will is a major factor and it comes down to a choice of the state of the person (even if a very long choice with many psychological factors).

And the question is really, how and why we know this. It is our knowledge of good and evil, and everything possible of free-will to choose and is evil, is in fact really actually possible for it to choose.

That is why I spoke about the story of people of Lut in Quran, because it puts into the worse context. A context where people were choosing this to the extent the society men became lustful towards men instead of women and began to justify other crimes.

I know no one accepts this story as probable or even historically possible, but it is no doubt philosophically possible.   So the sin shown philosophically, going back the premises of what is rationally possible of free-will to do of evil, is in fact actually possible of free-will to do of evil.

I hope for an honest discussion but won't hold my breath!