Help My Friend Say Skillet use to be a Christian Rock Band but are not now?

My friend keeps saying Skillet(Band) is not a Christian rock band, yet everything say they are and she wont belive me. She says they have a song "Go To Hell". I know the song does not exist by Skillet. I know there a Christian rock band but she will not belive me. Please help me prove her wrong or send me a link to Skillet bands site where it tell you they are a Christian rock band