Pastor Rick Warren said that there is no such thing as christian music, only christian lyrics. I do agree because I don't think that satan worshipers are singing about the Word becoming flesh and dying for all of mankind so that they can be saved. Beware of the wolf in sheeps clothing. On the other hand, since they are christians, writing the music to go with the gospel lyrics, I would say that their music is christian also.
Key point: What is the band saying? What are you feeding your spirit. The Spirit gives life; the flesh counts for nothing. The words I have spoken to you are spirit and they are life. John 6:63
As new born again believers we are constantly growing and changing, if you know what's good for you. The bands that are saved and don't preach christ, in their lyrics, do serve a purpose. To compel them to come in so that My house may be full. Once they are in then the band gives a testimony and hopefully gives an alter call or says a prayer with the audience for salvation.
But for the christian that needs meat, Bloodgood is a high octane dose of the Holy Ghost (in the name of Jesus Christ.) They have a set of songs that take you from the event when Jesus is taken to Pontius Pilot (sung from his perspective) to the scourging, the crucifixion and His glorious Ressurection.
Check out some samples on Amazon.com God Bless you all who seek the Lord for you shall find Him. In the name of our Annointed Lord and King Jesus. Amen.