Nope. Anti-gay bilge like this is just Christian Viciousness in a suit and tie.
Mind you, I have doubts about the existence of a 'gay gene' myself: if such a thing existed, it would see to be a prime candidate for being 'selected out'. But this sort of pseudo-rational argument is just smoke from the fires of Hell.
Oh puh_leeez. Why would the idea that everyone is given free-will an arguement from the fires of hell? What comes from the fire of hell is the LIE that people have no choice, they are born that way, then tag them with a lable of being 'gay'. You are very confused.
I don't believe in a 'gay gene' either. But there are reasons why such a gene wouldn't be selected out. One theory is kin selection: a gay man is able to care for his kin and enhance their chances of reproduction, and his kin also happen to carry the same gene. A better theory is that homosexuality is an odd product of a gene which does something else entirely that is important for survival. My memory is fuzzy here, but I believe that cystic fibrosis results from having two copies of a gene, but if you have only one copy, you are less likely to get tuberculosis. The benefit of one copy of the gene outweighs the tremendous harm caused by having both copies, as far as survivability of the gene goes.