Read the first quarter of the article thoroughly, skimmed through the rest. Mmm! Not quite sure why any of it matters but I think the author is bending over backwards to make his point that Catholicism is not monotheistic.
I think of God as being at the top of a hierarchy, with angels (including the devil who, of course, was one) and saints, also the Virgin, as further down in the pecking order.
Incidentally, I've often thought that the Christian insistence on making a split between good and evil is unhelpful. From a psychological point of view it is better for people to acknowldge, understand and modify/control the 'bad' within them rather than struggle to 'cast it out'.
I rather like some Indian deities which have good/bad sides (sometimes nurturing, sometimes murderous).
Finally, I don't know why atheists have to take such patronising tones to believers, hinting that they are weak for craving outside guidance and not being up to facing the truth about death.
There must be more to it than that!