f opposition to same-sex marriage is as immoral as racism, why did no great moral thinker, in all of history, ever advocate male-male or female-female marriage? Opposition to racism was advocated by every great moral thinker. Moses, for example, married a black woman, the very definition of Catholic is “universal” and therefore diverse and has always included every race, and the equality of human beings of every race was a central tenet of Judaism, Christianity, Islam and other world religions. But no one – not Moses, Jesus, Buddha, Muhammad, Aquinas, Gandhi, not the Bible or the Quran or any other sacred text, nor even a single anti-religious secular thinker of the Enlightenment, ever advocated redefining marriage to include members of the same sex.

To argue that opposition to same-sex marriage is immoral is to argue that every moral thinker and every religion and social movement in the history of mankind prior to the last 20 years in America and Europe was immoral. About no other issue could this be said. Every moral advance has been rooted in prior moral thinking. The anti-slavery movement was based on the Bible. Martin Luther King, Jr. was first and foremost the “Reverend Martin Luther King, Jr.,” and he regularly appealed to the moral authority of the Scriptures when making his appeals on behalf of racial equality. Same-sex marriage is the only social movement to break entirely with the past, to create a moral ideal never before conceived. It might be right, but it might also be an example of the moral hubris of the present generation, the generation that created the self-esteem movement: After all, you need a lot of self-esteem to hold yourself morally superior to all those who preceded you.