Your views are grounded neither in science, nor logic, nor fact. I bring up Creationism because that, like your stand on gay marriage, is based 100% on blind faith and not one whit on science, logic or fact. It is entirely pertinent to the discussion.

For the record, I find it laughable that two or three sentences in the New Testament (some of them of questionable authorship in the eyes of modern Biblical scholars) are enough to condemn an entire segment of the population to live as second-class citizens. Jesus never mentioned homosexuality once, nor did he preach the sort of intolerance that many churches established in His name do. This is no different than the way that churches supported slavery and then, after the Civil War, laws against miscegenation and equal rights for blacks on the basis of a few sentences in the Bible. More was said by St. Paul about how women should always wear hats in church than about homosexuality, but you don't see women wearing hats in church. It's just another example of being selective in faith.

And yes, I do think that race and sexual identity can be equated. People are killed, often after being brutally tortured, because of their sexuality and their sexual identity. I think you pointed out to me that I should avoid the words "sexual preference" for now because they imply a choice. Science has shown that it is highly unlikely there is a choice.

I am not a biologist and do not have access to a full research library. I will ask a friend who has a Ph.D. in biology to supply me with some good citations for the work you are requesting. Until then, I will not let the perfect be the enemy of the good, and will cite the studies which, according to Wikipedia, have yielded positive results.

They are:

Hershberger, Scott L. 2001. Biological Factors in the Development of Sexual Orientation. Pp. 27–51 in Lesbian, Gay, and Bisexual Identities and Youth: Psychological Perspectives, edited by Anthony R. D’Augelli and Charlotte J. Patterson. Oxford, New York: Oxford University Press. Quoted in Bearman and Bruckner, 2002.

Bailey JM, Dunne MP, Martin NG (March 2000). "Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample". J Pers Soc Psychol 78 (3): 524–36. doi:10.1037/0022-3514.78.3.524. PMID 10743878. http://content.apa.org/journals/psp/78/3/524.

Bocklandt S, Horvath S, Vilain E, Hamer DH (February 2006). "Extreme skewing of X chromosome inactivation in mothers of homosexual men". Hum. Genet. 118 (6): 691–4. doi:10.1007/s00439-005-0119-4. PMID 16369763. http://repositories.cdlib.org/postprints/1413.

Blanchard R, Klassen P (April 1997). "H-Y antigen and homosexuality in men". J. Theor. Biol. 185 (3): 373–8. doi:10.1006/jtbi.1996.0315. PMID 9156085.

Garcia-Falgueras A, Swaab DF (2010). "Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation". Endocr Dev 17: 22–35. doi:10.1159/000262525. PMID 19955753.