I see here a big anti-religious rant when I wasn't even talking at all about religion.Isn't it obvious? Especially to someone who probably doesn't hold animals in very high regard (I'm talking about you, among hundreds of millions of others). You would likely hold to the idea or support that animals are even less capable of abstract thought than humans. That we are even more capable of controlling or resisting our base/primal/instinctual urges, animals less so, and that animals cannot as easily "reason themselves into" particular situations. i.e. it would be a lot less believable to claim that animals "decide" to be homosexual.
Anyway, to see homosexual tendencies played out in nature by creatures who, like us, have the male/female dichotomy points to it being due to either an instinctual drive, and therefore more out of their hands to control. Hence the correlation drawn to the human condition we witness - whereby people themselves report that they can't help which sex they are attracted to. And yet we have a group of staunch deniers who claim that these people are choosing to be homosexual.
And when you bring "God" into it (not that I think we ever should), that really gets people's hackles raised, doesn't it? Then you start talking about how God must have created these creatures (humans included) with these drives/desires, which really seems to insult people who believe that God would never create anything "imperfectly" (note: I do not view homosexuality as any sort of "imperfection" in the slightest - and believe it asinine to do so - a view only able to be held by those with a juvenile mindset). Why people get insulted on God's behalf, I will never understand. Seems to me like that itself should be considered some sort of "sin," if I am being honest. Like God should just come down and slap people who are this way, letting them know that He is a big boy, and can fight His own battles and make His own judgments. Alas... He's just never around when you need Him, is He?
The only thing relevant in what you wrote is that animals have homosexual instincts and follow them. Must we all, always, follow our instincts? Or is there some sort of animal kingdom rulebook somewhere with clear guidelines?