The challenging lawyers may well be correct, but is this a case of the genetic fallacy that will ultimately undermine an argument which could be based on equality and justice?

Lawyers trying to overturn Proposition 8 presented testimony of a gay man who said his evangelical parents forced him into Christian therapy to change his sexuality, and the legal team later produced documents that showed close ties between leaders of the Catholic and Mormon churches and the Proposition 8 campaign.

Ryan Kendall, 26, who grew up in an evangelical Christian family in Colorado, said his parents forced him to undergo therapy with a Christian group to try to change his sexual orientation. The therapy made him suicidal but did not change his sexuality, he testified.

… Attorneys challenging Proposition 8 also presented videotaped testimony from two experts on religion who had been retained by the measure’s defenders. The experts have since withdrawn from the case.

The experts agreed under questioning that some churches have contributed to discrimination against gays and that religion also has been used to justify discrimination against African Americans and women.

http://www.latimes.com/news/local/la-me-prop8-trial21-2010jan21,0,1121020.story