I think though that before we were Roman Catholic, we were British and later Irish Catholic, in a church founded by Joseph of Arimathea in England/Wales somewhere..some say Glastonbury, some say not.  I don't know.  But i know that the religion had to have been far far different than the often cruel mess we have ended up with.  Your Fitzgeralds..my own Fitzgerald ancestors..dimly remember something that was good and parts of it endure to this day.  We just have to trace our steps backwards, and recover what we can.