I have to hard disagree with this. First, St:V Sybok almost presented himself as almost a Messiah/Prophet type. There is no reason why a Vulcan who champions the religion of you-do-you because emotions are AWESOME wouldn't also be into gender freedoms as well.
Further though, I think that while some people do politicize religion or use religion as their own personal battering ram, it is a gross overgeneralization to assume that religion is simply a cover for bogots/bigotry. Religion has given us inquisitions, but religion has also given us hospitals, libraries, and universities. Monks spent lifetimes copying books both holy and otherwise. I just went to a pride parade and watched a number of Christian groups marching in it. It's just not nearly as dramatic, so it doesn't make the news. I would argue that believers are as diverse as any other group. Who Watches the Watchers wouldn't be as interesting if the Mintakan's saw "The Picard" and spontaneously built a hospital though.