Evolution eliminates gay gene?

First, sexual orientation isn't an either/or proposition.  Some of the research done in this field, particularly Kinsey, indicates that we're bisexual shades of gray. Sexual orientation, by this hypothesis, is measured on a scale from completely straight to completely gay with various degrees of bisexuality in between (bicurious straight, bisexual-straight, bisexual, bisexual-gay, etc).  Personally, I suspect that the God's-eye view of human sexuality would look like a weighted bell-curve with most of the population leaning toward the straight side but I'll await further data if anymore research is done.

Second, you're committing the logical falacy of false dichotemy.  Your apparent thinking is that either there is a gay gene OR it's a lifestyle choice.  Some of the research on male homosexuality indicates it may have to do with conditions in the mother's womb. Others think that it may be a polygenetic trait.

Third, just because a gene isn't conducive to reproduction doesn't mean that natural selection necessarily wipes it out.  There are recessive genes that can dodge natural selection.

Fourth, the jury isn't out among reputable psychologists regarding sexual orientation.  The evidence clearly shows it's in our nature, not our nurture.  We still await the findings as to the exact cause but self-determination has been ruled out.

Fifth, I question whether or not homosexuality even constitutes a distinct "lifestyle" never mind a "choice".  I'm married to the love of my life who happens to be a woman.  Some would say I've chosen the "heterosexual lifestyle" but I don't think of it that way.  What if the power of God were to transform her into a man?  Would I be living the "gay lifestyle"?  What would be different?

To contrast with what I do consider a "lifestyle", we're married and in a monogamous relationship (as opposed to the life I had when I was single and lived alone).  Here, there's a great distinction that calls for the label "lifestyle".  I share my home with another, for example.  Married vs. single is a lifestyle distinction.  Gay vs. straight is a matter of how much lube you buy.

you've raised some good points.

sounds like there's interesting and ongoing scientific investigation into this topic from different angles.

In your gay-bashin bible video, you refute the fundichristian, slippery-slope comparison of homosexuality to pedophila, by correctly pointing out that one is between consenting adults, whilst the other is non-consensual as a child's mind is not developed enough to give proper consent. Fine.

Maybe legislaters and policy makers in the U.K. and Spain over the last generation similarly thought that whatever occurs between consenting adults should be decriminalised, before proceeding to legalise gay marriage.

But,

does that make prostitution more acceptable because it is also consensual?