Perhaps you are not seeing the religious side of St. Patrick's day because you spend it at a pub instead of a church. I certainly haven't see any Christian activity going on at any bar I have visited on Sunday or any other day for that matter.Let me put it this way. When I go out to the pub(s) on St. Paddys day, they are not filled with middle eastern people/muslisms....they are filled with blond and red headed scotch/Irish/english decendants swigging down ale of all kinds.
In fact, I rarely, if ever, see anyone close to what I would call a muslim in any drinking establishment at all.