Plot (Spoiler)

Francis Griffin, Peter’s father, who is very dedicated in the Catholic faith, visits Quahog and insists that Stewie be baptized. Francis and Peter go to St. Philip’s, where the priest refuses to baptize Stewie because he claims the holy water is tainted. Francis does not believe this and pushes Stewie onto the baptismal font. Stewie quickly becomes sick, so Peter and Lois take him to the hospital, where a doctor quickly and correctly diagnoses Stewie’s condition as exposure to tainted water. Stewie is quarantined in a germ-free environment. Lois asks Peter what his religious beliefs are, sending him on a quest to find out.