To understand what he is trying to do when he speaks about faith and poltics. It's really not what you fear.
I can't repost the whole thing, although it is well worth reading in it's entirety. If only to appreciate the thoughtfulness of the man, his views on this issue aside.
It was because of these newfound understandings that I was finally able to walk down the aisle of Trinity United Church of Christ on 95th Street in the Southside of Chicago one day and affirm my Christian faith....
That's a path that has been shared by millions upon millions of Americans - evangelicals, Catholics, Protestants, Jews and Muslims alike; some since birth, others at certain turning points in their lives. It is not something they set apart from the rest of their beliefs and values. In fact, it is often what drives their beliefs and their values.
And that is why that, if we truly hope to speak to people where they're at - to communicate our hopes and values in a way that's relevant to their own - then as progressives, we cannot abandon the field of religious discourse.
Because when we ignore the debate about what it means to be a good Christian or Muslim or Jew; when we discuss religion only in the negative sense of where or how it should not be practiced, rather than in the positive sense of what it tells us about our obligations towards one another; when we shy away from religious venues and religious broadcasts because we assume that we will be unwelcome - others will fill the vacuum, those with the most insular views of faith, or those who cynically use religion to justify partisan ends.
In other words, if we don't reach out to evangelical Christians and other religious Americans and tell them what we stand for, then the Jerry Falwells and Pat Robertsons and Alan Keyeses will continue to hold sway.
More fundamentally, the discomfort of some progressives with any hint of religion has often prevented us from effectively addressing issues in moral terms. Some of the problem here is rhetorical - if we scrub language of all religious content, we forfeit the imagery and terminology through which millions of Americans understand both their personal morality and social justice.
Imagine Lincoln's Second Inaugural Address without reference to "the judgments of the Lord." Or King's I Have a Dream speech without references to "all of God's children." Their summoning of a higher truth helped inspire what had seemed impossible, and move the nation to embrace a common destiny.
http://obama.senate.gov/speech/060628-call_to_renewal/