Hi Pat.
In my research for the Stevenson(Stephenson) part of my family I have used LDS Family Search.
The link below shows Minnie and William in the 1945 census with his 3 children (I presume) from his first marriage. There is an original document you can view there which shows he was RC and she was C of E and his children were baptized RC. They are listed as living in St. John's West so maybe an RC church in that area may have records. I hope this helps a little.
https://www.familysearch.org/ark:/61903/1:1:QK9Z-LZXC" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;
regards,
shawn