The Bible condemns homosexuality.

[Angrboda]

What is "disgracing the sexual attraction purpose trust"...................?

There is a beautiful trust in men and women complimenting each other, and finding a balance in that nature. If free-will has a role, we ought to make sure, we make our state that which brings the most meaningful relationship out of the two, which is obviously between a man and a woman. 

Now if they were both just as good, the right thing to do would be to be Bi and relationships to be of that kind and family units to consist of those relationship.  However, the superiority of man to woman and over all monogamy, and it's beautiful relationship and meaning that comes out of it,  ought to be, that we all push each other towards that, and not just let a free- for all happen, where if someone wakes up in a certain state, does an action while a child, then society convinces him he is this and that, that is far worse, my friend.

Is making an inferior choice a moral evil though?

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You reckon gay couples harm children, or society.... somehow?

Gayness as a threat to civilization?

It can - it won't necessarily but it can.

And heterosexual parent can harm their children, not necessarily but possibly. This isn't an indictment of homosexuality but one of bad parenting.