I honestly have no idea why Christians are so vehemently opposed to the possibility of someone being born with an attraction to the opposite sex: please be consistent - if you are so certain that the sin in this world can result in children being born with terminal illnesses and physical/neurological disabilities, then why all of a sudden contend that "no, God CAN'T create people like this!"
Why would a world in which people are only homosexual by choice and not born that way strengthen the argument that homosexuality is wrong? By that logic, people can justify rape since the normal person is born heterosexual and thus unable to control his animalistic desires...since when does the source of the desire or the way by which it comes about define the morality or immorality of a certain action?
Good grief, seriously...[and God said, "Let there be logic"]