islam vs christianity: the Daily Show version
"Steve, this debate is about religion; let's discuss it rationally."
This brilliant clip of Steve Carell and Stephen Colbert arguing which religion is better is already a couple of months old, but I hadn't seen it yet, being unable to catch Jon Stewart regularly.
The pray-off proves nothing, but they do find agreement on one fundamental point: their common "enemy".
Mordant comedy just doesn't get any better than this.