I realize this is hypothetical, but it cannot happen. No behavior is caused strictly by genetics.
No-one says it is. Even if homosexuality is genetic people can of course resist the predisposed temptation to follow it. That said, it could be argued that the desire to follow a number of behavioural tendencies could be influenced by genetics. It doesn't mean that one should follow those behaviours or should not follow them only that that is where the desire for them might derive.
Something being wrong is independent of whether or not we are predisposed of it. If you though think that God deliberately set up all humans with the potential towards homosexual feelings only to prohibit it then you believe in a capricious God and you are welcome to him.
We are simply 'sexual' beings. Homosexuality is an inability to relate appropriately with the opposite gender.
How many homosexuals do you know? How many straight people, for that matter do you know? I know many straight people that operate very badly with the opposite gender. They aren't homosexual or even slightly inclined towards it. Similarly, I know some homosexuals that get on very well with the opposite gender.
To put it bluntly, the above is complete drivel.
We would all certainly raise our brow at the 'pedaphile gene.'
I wouldn't. If it had scientific backing then it could be. Does not excuse the action but helps us to understand and help those with it.
I don't believe for a second we are 'born this way.'
"You are not gay..."
...you are ugly
...you are socially inept
...you are into 'disgusting'
...you had bad relations with an overbearing mother (father)
...you are emotionally/mentally unstable/confused
...you don't understand that love and sexuality are not the same thing
You're a bigot.
Whether or not someone is ugly or not (subjective) has nothing to do with their sexual preference. Whether or not they are inept has nothing to do with their sexual preference. What they are in to has nothing to do with anything and something being considered disgusting certainly does not mean that it is immoral.
How can you pretend to know the relations that all homosexuals had with their parents? How can you even pretend to know what homosexuals feel for their partner? This is speculative bigotry, nothing more and it will only invoke the opposite response.
A similar list would go for adultery, philandering, and other problem behaviors. There is no reason to confuse these with genetics, they are behavioral choices.
The tendency to be an adulterer could certainly be indirectly associated with genetics (abnormal sexual desires, etc) but of course it is a choice and it is wrong entirely on the basis of the fact that it
effects other people. Two homosexuals in a consensual relationships is not your business and harms no-one.