...when trying to ascertain in which particular religious establishment your ancestors were christened/married/buried (hatched, matched or dispatched) If you know the marriage venue you stand a better chance of discovering where subsequent events related to that couple occured (births/deaths)
We share this problem, great Uncle Samuel decided to retain the Cushnaghan name when he married in a civil ceremony in Edinburgh: all his peers, that I have so far traced, married in RC Churches under the name CASSIDY.

Most of the family moved to Renfrewshire, Scotland, but my father's line stayed in Antrim. Da was born in Ballymoney: I was born in Ballycastle because that's where my grandparents moved to when my Da was a child