From an outsiders perspective, since I was never exposed to religious dogma, this kind of thing looks like no more than adherence to authority and tradition by people for whom religion, in this case RC, is an important aspect of their lifestyle: to me it does look very like created rituals (crawling on hands and knees etc) reinforced by associated learned behaviours, and in that respect it seems similar to the Muslim Haj.
Like NS, I just don't get it.