Sorry, but that's not how it works. Research done in a single metropolitan area is not representative of anything outside that area, and that's just the way it is. It doesn't matter if you're researching homosexuals, Christians, or guys named Bob. The only disproving needed is that you have no proof.
Some compilations of surveys, ignored by the Christian Right, showing that there's very little consistency anywhere.
2000 Census -- percentage of same-sex couples by state ranging from .47%-5.14%
60 years counting queers: Gay population studies since Kinsey Information on various studies reporting a homosexual population of somewhere between 1-9%
How Many Lesbians and Gay Men Are There? an exploration of Gay demographics Same same.
Demographics of the Gay and Lesbian Population in the United States: Evidence from Available Systematic Data Sources "...overview of standard social science data sources that now allow some systematic study of the gay and lesbian population in the United States..."
Oh, here's a fun one: Prevalence of Homosexuality Brief Summary of U.S. Studies (Compiled 6/99)
The only disproving needed is that you have no proof.
It's hard to ignore the mountain of proof, published in respected, peer-reviewed scientific journals by licensed mental health professionals. The results are not bull's eye consistent, but they all point in the same direction.
http://archpsyc.ama-assn.org/issues/v58n1/ffull/yoa9456.html
"People with same-sex sexual behavior are at greater risk for psychiatric disorders ... Compared with heterosexual men, homosexual men had significantly higher 12-month and lifetime rates of mood and anxiety disorders ... homosexual women reported a substantially higher rate of substance use disorders than did heterosexual women ..." .