I'm glad to see one of the atheists at DailyKos say this, because I think it needs to be said. I am a Christian, and have been for longer than I've been a Kossack, and while I have no problem with advocating for the Kossack line, I do sometimes feel the wound when one of my fellow Kossack disses on religion.
Make no mistake, they should be free to say as they please, but they should understand that the message they send is probably the wrong one to be sending, at a time when what we really need to develop, is a political alternative for Christians on the left.
Sometimes it helps to reduce things back to basics, to step back from a generalized picture of what motivates the people you seek to persuade or debate. I think if people step back, they might see a greater variety of subjects where they have agreement with Christians, than they otherwise might.