No. They swear in their songs and their music doesn't glorify God so even if somebody were to give them the tag of "christian rock band" it would not make a difference. it would be like saying that a cat that looked like a dog actually was a dog. Regardless of how much you say it is a dog it will not spontaneously change its genetic makeup and suddenly be a dog.
That being said, God can and, I believe, wants to change the hearts of that band towards himself.