Sounds like total crap to me. The people on the left that I've heard advise others on faith go out of their way to stress just the opposite. That's a large part of why people like Atrios jump all over folks like Mara Vanderslice whenever they can.
Seems like a couple of bloggers with the Edwards campaign should have been listening more closely.
Aside from referring to the time Bill Donohue jumped all over her, the only time I referenced Vanderslice was in this post. But, in any case, here's a long interview with her so you can be the judge yourself. Different people will take away different things, I imagine.
Here's more conservative love for the religious left.