Hold on.... marriage of James Saul and Jane Lambert 20th December 1865 in St Thomas CoI. James' father listed as James Saul Labourer. No mother's name recorded. Address 12 Marlboro Place.
Jane's father is George Lambert, no mother recorded. Address 5 Upper Gloucester Place.
So it looks like your Sauls from Wicklow (possibly Rathdrum) were Church of Ireland with James and Catherine Delahunt marrying in a Roman Catholic church.
I hope these are the right people and I am not leading you astray.
Right I need a cuppa after that : )

Amy