In his epilogue he posits that perhaps the ecclesial discord is part of God's plan, and I've thought that myself many times. Easier to preserve a remnant, IMO. I see the ecumenical movement as dangerous too because when all is said and done, I don't see the capacity for true intropspection. Maybe I'm wrong, and I wouldn't mind being proved wrong at all.
Sounds like Paul Johnson has the makings of a first-rate Reformer. 8~)