I'd never heard that St. Christopher song...interesting that it came out around the time that Disco 2000, or ''Gloria'' as it was workingly-titled, was being demoed. Isnt' there a 60's song with a lyric similar to ''What are you doing Sunday baby?'' aswell.
Tony Orlando & Dawn: (obvious influence/connection there)
What are you doing Sunday baby? Would you like to marry me? What do you say now? If it's a nice day now What are you doing Sunday baby? Gee, I wanna marry you Oh, what are you doing Sunday afternoon?