As crucial as religion has been and is to the life of the nation, America's unifying force has never been a specific faith, but a commitment to freedom - not least freedom of conscience.

Attacks on a politician's identity - questioning Romney's religion, say, or Obama's birthplace - tend to come when an opponent is desperate and can't sell himself.

Whether one believes or not, religion is as real a force in the life of the world as economics or politics, and it demands fair-minded attention. Even if you think the entire religious enterprise is at best misguided and at worst counterproductive, it remains vital, inspiring great good and, sometimes, great evil.

If a person is homosexual by nature - that is, if one's sexuality is as intrinsic a part of one's identity as gender or skin color - then society can no more deny a gay person access to the secular rights and religious sacraments because of his homosexuality than it can reinstate Jim Crow.

In America, now, let us - Christian, Jew, Muslim, agnostic, atheist, wiccan, whatever - fight nativism with the same strength and conviction that we fight terrorism. My faith calls on its followers to love one's enemies. A tall order, that - perhaps the tallest of all.