Thanks very much! I'm sorry for the delayed response, I just found this. Can't tell you how much I appreciate your help.
I don't know for certain if the Burnett's were Presbyterian, but its consistent with their daughter's eventual religious association (Gladys married Raymond Grayson and settled in Harwich Port, Massachusetts ... they attended the Congregational Church there)
Became a topic of discussion over the holiday's as my brother-in-law's wife is a Colloton originally from Iowa.