I love Mitchell and Webb, freakin' hilarious satire. Tim Minchin I just recently discovered and completely exasperated his library. But I'd have to point you towards Jim Jeffries, if you're going for godlessness. Also, David Cross, funny story:
I saw him, David Cross, live in Denver in 2004(?). He's going off about how to support the troops by voting Democratic, when these four people get up and walk out. His bit is all about how the christians are trying to take over the U.S., but it's a very subtle build up. Anyway, right as they get close to the door, he goes silent, watches them go out the door and says "Wait! I didn't even get to the part about how God is a fag!"
He turns to the audience and says "Just kidding! I just wanted that to be the last thing they heard tonight."