This is my first message.
I think that the article on Angels (http://www.straightdope.com/mailbag/mangels.html) went a little too easy of the word Dogma. We cahtolics only Dogmatise really important stuff. There are no Dogmas about Angels’ hierarchies, as there isn’t a Dogma about Satan. Angels DO exist, so does Satan, but the whole hierarchy thing is left for us to belief or not.