(S01E03) "I like my miracles with more smiting and lightning." - Burke

Would the FBI really help a bad guy get a church Bible back? Sure, it turned out to be a very important Bible, but the way that Barelli just comes into the FBI and asks for their help in getting the book back and the chief takes him seriously from the get-go didn't ring true to me. Sure, Burke told him to just go to the local police, but then the chief pulls him aside and says that he doesn't need the Archdiocese breathing down his neck about it. That just seemed like a way for the writers to justify the plot in the first place.