After being expelled from school Bart enrols at a Catholic seminary where he is much influenced by charismatic Father Sean - as is Homer after Marge sends him in to sort things out,and both Homer and Bart convert to Catholicism,chiefly because Father Sean makes it sound like fun. Enlisting the help of Ned and Tim Lovejoy,Marge abducts Bart and takes him to a Christian rock festival,resulting in a stand-off between the two faiths.
—don @ minifie-1