This is a very tough subject, as I know a few gay people, one of which is an uncle I adore.
He is incredibly giving, loving, and has strong moral values. When you talk to him about it, he says that he was born that way, as he has never been attracted to a woman in his life.
He has no reason to lie about this, and in his defense, I have never been attracted to a man before.
I have taught my son that people have genetic predispositions to being homosexual or bisexual, but that doesn't diminish their value as people, and to treat everyone the way you want to be treated.
No, my children haven't grown up in a religious household, but they have been exposed to empathy and unconditional love. They have been taught to be good for the sake of being good. They are not judgemental, as they are very accepting of those that are different from them.
The world needs more love and affective empathy, and less judgement and division.