When Did Christianity Arrive In Western Scotland

Recent archaeological findings just might help give an answer to the question of when Christianity established itself in Western Scotland.  The typical date is given around 1000, under the leadership of Sigurd Hlodvirsson. There are indications that it predates the Viking conquests/settlements, however.  Crawford has a book entitled Scandinavian Scotland and she allows for some continuity between the church, raising that very likelihood, in my mind.  Now, it looks as though one might have a chance to see what further light archaeology may bring to bear on the matter: