Thanks for the basic review. I know a number of people who have read the book. I'm sure its entertaining reading. The entire premise is silly. A conspiracy? Mighty big conspiracy kept way too tight for way too long. Entertaining, perhaps. Silly, certainly.
It almost might be an entertaining movie on it's own, but for me, it's been ruined by my friends who insist it's truth (Catholics, educators, moms) and why won't I acknowledge that? Then there's Ron Howard's insistence on painting Opus Dei as some demonic fiendish group, and his refusal to issue a disclaimer.
As a straight up fictional movie intended for entertainment, it might just be entertaining. I don't know. But, LOL, if I somehow see it, and I won't add to the opening weekend box office numbers, I agree, there will be some fun in the laughing at the silly parts.