As assistant to the celebrity pastor of an evangelical mega church, Arthur obeys orders, attacks paperwork, and guards against sin. So Arthur is surprised when the church pastor commissions a mural from Irene Hoff, an atheist New York artist married to another woman. Arthur is even more surprised when the pastor explains that he believes Irene has been chosen by God. But the biggest surprise of all is what happens when Irene shows up and starts to paint.