Found these guys when I searched that kick ass song in the Silverado commercial. With the vocals and drum riff, I thought it was a lost Led Zeppelin track. Awesome band!
The band members are religious men themselves so I interpret this video as criticizing the way that the church presents it's self in an archiac 'oldy' dated way that make people think it's crazy more than the act of believing itself. Which can be totally less mental.
I think it means you can be humble and a believer and rocking at the same time. Rock is not a bad or evil thing just like faith doesn't have to be boring.