I think a lot of bands are influenced by religious symbolism and not even necessarily Christianity or Catholicism.
It is not in the books of the Philosophers, but in the religious symbolism of the Ancients, that we must look for the footprints of Science, and re-discover the Mysteries of Knowledge.
All religious expression is symbolism.
Religious beliefs are sacred to people, and at all times should be respected and honoured.
Symbolism perhaps is a bit in your face, and I've tried my best to control that as best I can as I've grown older and thought that one could approach something with a little more subtlety.