God also gave us free will, something a lot of Christians seem to forget.
So, going by the logic that people cant be gay because their parents are male and female, does that also mean im not allowed to date/marry a black girl because both my parents are white? (its the same principal).
Look, bottom line is, you can hate homosexuality all you want, but you really have to face up to the fact that some people will be gay and there is nothing you can do to stop that, dwelling on something you have no control over is a real good way to waste your own life.
And i have one more question for all the homophobics here, give me one good example of how legalising gay marriage will affect your life or lifestyle?