So now homosexuals are a race?
That's not what I'm saying. You answer your own question of "why are you a raging homophobe?" with "I'm not going to teach my kids that it's normal or moral". My analogy was a bit more extreme, but it still uses your logic.
While scientists haven't found the precise determination of homosexuality, there is far more evidence to support that it's a natural occurrence rather than simply being a choice like your beliefs state. This evidence can be seen in the animal kingdom, where homosexual acts are displayed across a vast array of species. I'm not just talking about a male dog humping another male dog in a hormonal overdriven rage, I'm talking about same-sex bonding, even lasting years (I can't remember their names, but Google gay penguins in NYC zoo, they even raised a chick together). There are physical characteristics seen in homosexuals not seen in heterosexuals of the same sex. There's studies showing that gay men have similar physical brain structures to straight women, for example.
There's even the simple question of, "when did you choose to be straight?". A question all too often avoided by homophobes. For a quick experiment, choose to find another man sexually attractive.