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!Spoiler for Relics of the Old Faith!
??? will still give him to you as part of the reward after freeing the Bishops.
certified trophy wife moment
One important thing to notice is that this Narinder does NOT have the "immortal" trait like his counterpart which you spare after the boss fight.
This could just be a glitch, but if it's not, it may imply that Lamb is able to strip away other gods' immortality through bringing death to them, and if we choose to spare Narinder, he has never actually died and thus is able to keep his immortality.
So my theory? The Bishops were originally immortal too, just like TOWW, until they were slain by us.