As an Orthodox Christian who believes at least in the spiritual authority of scripture, you cannot make comparisons between the human species and the rest of the animal kingdom. What you do need to address are the two claims, one being that genetics cannot be used to prove homosexuality as a biological predisposition because of the lack of complete 1:1 correlation in identical twins; and the fact that enlarged hypothalimus does not necessitate homosexuality.
I think we are getting hung up on the nature/nurture issue too much, as though the question of whether same-sex attraction is a passion or not depends on this. It doesn't
depend on this. Alcoholism is also a passion (yes, cleveland, I'm afraid it is!) but if an alcoholic stops drinking for the rest of their life, they have conquered their passion instead of letting it conquer them. And although there is some evidence that there is a genetic predisposition towards increasing the chances of becoming alcoholic, genetics alone cannot determine who will or will not become alcoholic.
And the question of whether God makes people gay or not is also moot. We Orthodox hold that we are the result of generativity, not creation. Our soul does not come into being out of nothing, but is generated from the souls of both our parents, just as our genetic code is. So God didn't "make me", my parents did, and their parents made them, and their parents made them and so on all the way back to Adam and Eve who alone were originally created by God. So who I am is a result of of who all my ancestors were before me, and my particular passions are a result of the same. What I choose to do with this is entirely up to me- and of course, my knowledge and understanding of this.