Yours truly, married with three kids, and a churchgoer, supports the recognition of gay marriage, for somewhat quirky reasons that don't matter to this article. (I spell out my quirky reasons here, contending there is a religious argument for same-gender unions.) American society is now inalterably on track to broad if not universal acceptance of gay marriage and, when the razzle is over, future generations will wonder why the whole matter was controversial in the first place. I don't think same-gender union will usher in the Age of Aquarius: Married homosexuals will bicker, become unhappy, and divorce at about the...