Director David Gordon Green’s weirdly cautious reboot of the “Exorcist” franchise, the first of a planned trilogy, comes with the name “The Exorcist: Believer.” And we do, insofar as believing in money is concerned. Green recently wrapped up his “Halloween” trilogy, which started well enough, and made a lot. The second one went sideways, not collapsing, but the finale, “Halloween Kills” landed ...