Cannibal Corpse is a Death Metal band formed in 1988. Their lyrical themes are moaning, screaming, growling, snorring and coughing at the microphone. They are anti Christian, but calling them Atheists is wrong because they obviously sport eating people and sacrificing goats to the Satan, but calling them Satanists is wrong too, because they're not, they're artistic if anything. Much of Cannibal Corpse music has been banned in Australia and Germany because it's considered harmful. 
I'm guessing that this is meant to be a joke, but their lyrics are obviously tongue-in-cheek, and they're actually nice people. One of the members is a WOW nerd. They're not "douchebags" or unpleasant people.
Have the authorities in Australia and Germany got stuff wrong? Are Cannibal Corpse just having fun? Liberapedia doesn't know.