But I do find the new-found piety a little curious. Just a sampling:

Paramore - A little pop punk band that has been fairly popular over the last few years.
In an interview with the BBC, Josh Farro stated "Our faith is very important to us. It's obviously going to come out in our music because if someone believes something, then their worldview is going to come out in anything they do. But we're not out here to preach to kids, we're out here because we love music."

Kings of Leon
Nathan, Caleb, and Jared Followill were born to Leon Followill, a Pentecostal evangelist minister ... The brothers spent much of their youth travelling around the South with their father ... The boys learned to play drums, guitar and bass as children while performing gospel songs in the church ...

The Killers - Lead singer Brandon Flowers is Mormon. Their biggest song, All These Things I've Done has undeniable religious meaning:
"When there's nowhere else to run
Is there room for one more son ...
...I need direction to perfection ...
I got soul, but I'm not a soldier
Help me out
Yeah, you know you got to help me out ..."
The " ... I got soul, but I'm not a soldier" line is a good line and has been used by other artists in concert, including U2, Robbie Williams and Coldplay. I think that it's a positive line regardless how you take it. It's popularity probably relates to it's pro-faith, anti-war message. But I think it can be taken as having faith but not being a soldier for it. Meaning: don't push your religion on others.

U2 - U2's always had Christian imagery in their music. From their most recent album, No Line on the Horizon (a very good album BTW), the song Moment of Surrender:
" ... I was speeding on the subway
Through the stations of the cross
Every eye looking every other way
Counting down 'til the pain would stop
At the moment of surrender
Of vision over visibility
I did not notice the passers-by
And they did not notice me ..."
Jonas Brothers - Evangelical Christians, with Assembly of God pastor father. They all wear purity rings, signifying a promise of celibacy until marriage. A noble enough goal, if just a bit unrealistic. And studies have shown it to be ineffective.
But, you know, whatever. To each his own. I don't think that music fans completely buy into whatever their favorite bands are selling anyway. You could probably have a devil worshiper rock star out there that would sell a lot of records as long as his songs made you shake your ass. Actually, there probably have been some of those.
I have a friend that is a huge Springsteen fan but detests his politics. There used to be legions of frat boys at Rage Against the Machine concerts that wouldn't have the first clue about what any of the songs referred to. And that's OK. Probably 3/4 of the allure of songs is the music itself. If you get something out of the lyrics, that's a bonus.

