Religions are divisive and quarrelsome. They are a form of one-upmanship because they depend upon separating the “saved” from the “damned,” the true believers from the heretics, the in-group from the out-group. Even religious liberals play the game of “we’re-more-tolerant-than-you.” Furthermore, as systems of doctrine, symbolism, and behavior, religions harden into institutions that must command loyalty, be defended and kept “pure,” and—because all belief is fervent hope, and thus a cover-up for doubt and uncertainty—religions must make converts. The more people who agree with us, the less nagging insecurity about our position.