Ex-Warpriests
A warpriest who grossly violates the code of conduct required by his god loses all spells and class features, except for his armor, shield, weapon proficiencies, and bonus feats. He cannot thereafter gain levels as a warpriest of that god until he atones for his deeds
Here:
http://www.d20pfsrd.com/classes/hybrid-classes/warpriest/archetypes/paizo-- -warpriest-archetypes/sacred-fist
Keep Flurry of Blows, but lose AC bonus? Other features?
He loses everything except proficiencies and bonus feats.
Flurry of Blows: Gone.
AC Bonus: Gone
Unarmed Strike: That's a feat so he keeps it.
Blessed/Miraculous Fortitude: Gone
Ki Pool: Gone.
Not to mention his vanilla Warpriest abilities, Fervor, Channel Energy, and Blessings: All Gone.
In other words, a normal Warpriest loses less if they become Ex-Warpriests, because at least they have the same number of Feats - if they're human/half-human - and proficiencies as a Fighter.