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It was probably an oversight that happened when priests lost the ability to see the troops in the region. Not exactly sure how/when it happened. I really don't think it was intentional.
you can't even see your own faith if you are priest lord.. XD
Yes, however, if you try to "politely sway him to the true path" it would be a waste of time if you are talking to a Lord that adheres an evil faith.
Depends--he could be bribable.
Or could have you arrested and burned at the stakes too. Just saying.