Looking for a feat

[pad300]

I seem to remember a feat that gave you bonuses against (pick a religion/faith), but I can't remember the name (kind of like Favored Enemy but for a faith rather than a species).

[Dragonchess Player]

There's Blade of the Purge, which converts the bane class feature to apply against followers of an "opposing" deity instead of a creature type.

[I grok do u]

There is the Divine Champion warpriest archetype that has the Know the Infidel class feature that acts exactly like what you are asking for. Maybe you misremembered it as a feat?

[ericthecleric]

There is also the Heathen Slayer heirophant mythic ability.

[Tom Sampson]

There is the Zeal inquisition, which explicitly obtains favored enemy bonuses against a religion you select that is opposed to yours, but that is not a feat.

[Name Violation]

Usually I'd say Dedicated Adversary, but thats just favored enemy