TLDR. While I agree that only one flag should ever fly at our embassies, religion should also never be used for the basis of any US policy.
There are just as many (maybe more) geneticists, psychologists and psychiatrists who believe that ones preference is not a choice. If so, explain why humans aren't the only animals that have same gender relations.
I am not going to argue with one's religious beliefs as it will never change anyone's mind just as I won't change mine.
I remain baffled why people care if it's a choice or biology, as if that makes it any more or less of their business.