Bachmann is an evangelical, and has spoken rhapsodically about the experience of being born again. After that moment, she said, “I absolutely understood sin, and I wanted no part of it.” She plunged into politics nonetheless.

We routinely place her in the “religious right,” a phrase that frustrates me, tidily linking a certain set of political beliefs with profound devotion. We talk much less frequently of any “religious left,” and that disparity implies that a seriously faithful person is most likely to land on just one end of the political spectrum.

Tell that to the Nuns on the Bus, who rolled across the country last month focusing on social welfare and expressing alarm about the impact that cuts in federal spending might have on struggling Americans. Their politics line up more neatly with liberal than conservative policies, but the nuns reflect a Catholicism no less true or widespread than that of the bishops carrying on about gay marriage and birth control.

Speaking of gay marriage, both the Reform and Conservative branches of Judaism in this country have embraced it, and the Episcopal Church in the United States has developed a special blessing for same-sex couples. Leaders of these denominations would tell you not that they’re flouting Judeo-Christian tradition but that they’re doing full justice to their faiths, which hinge on more than reflexive fidelity to chosen passages from ancient writings. They hinge on the human intellect and its ability to filter timeless values through modern understanding.

Because he’s a social liberal, Cory Booker, the Newark mayor, is seldom mentioned in terms of religion, but it turns out that he’s made a study of the Bible, as well as other sacred texts, and given considerable thought to faith. On his Facebook page a few months ago, he mused thusly:

“Before you speak to me about your religion, first show it to me in how you treat other people. Before you tell me how much you love your God, show me in how much you love all His children.”

I know many progressive, big-hearted Christians who rise to that challenge, and it’s wrong for a single Christian label — without asterisk or annotation — to be attached both to them and to the likes of Bachmann.