Pretty fascinating stuff. Pastor Ted Haggard (yep, that one) plays a prominent role as well as Jerry Falwell.
I think I was most interested in the opening scene of Joel Olsteen's Lakewoood megachurch in Houston - housed in the former home of the Houston Rockets. Just the sheer numbers were amazing.
HBO site is here. Caveat: The Alexandra Pelosi is the daughter of Nancy Pelosi.
Edit: BagOfNothing.com uploaded a quick excerpt of Ted Haggard talking about how Christian's have better sex. It' gold.