My apologies if there is a better way/place to ask this; I didn't see anything and there seems to be precedent for requesting this on Meta.
It's normal to have separate tags for bible-books and people. In that case I believe the proper tags should be 1-peter 2-peter and peter, with peter-apostle merged into peter. 3 of the 5 questions tagged 'peter' are about the man.
I made the changes to the remaining unretagged questions.
peter-apostle now has not questions associated with it.