Don't know about the rest of the band but the lead singer/lyricist is:
Lajon: I feel like you have to believe in something. Not to get all wound up in Christian stuff, but I am. I believe in the Lord, I pray every day. I'm a Baptist. I was able to put in a little bit of my growing up beliefs into a song and tell a story and it was really cool to be able to do.
Songfacts: But a prodigal son is somebody that wanders away from the faith. Is that something that's happened in your life?
Lajon: I don't think I wandered away, but as a younger man, I definitely got involved with more of the worldly themes.
You have to come back to your faith. I might have got off the beaten path there for a little while, just with the way that I wanted to live my life. It's cool now, but we all moved around. I look at my life and a lot of people say, "Man, you got wild." I say, "Okay, when you were in college you drank and partied. That was the same, I was just doing it on a tour bus. So we did the same thing, but I was under the microscope doing it."
We stopped doing all that and grew up a little bit, but "Prodigal Son" was definitely around that time where things were going on, but it was a cool story.
http://www.songfacts.com/blog/interviews/lajon_witherspoon_of_sevendust/
Beware: their music is good but they have some cursing in their stuff.