The REG does not list Angel of Might among the prophets.
The card itself contains the identifier "Prophet."
Can such an explicit identifier be wrong? Does the REG still override it?
http://images.wikia.com/redemption/images/2/28/Angel_of_Might_-_Kings.jpg
Looks like it is just missing. The only reason why an identifier would be incorrect is if the card is given Errata. The only card I can think of like that is King Ahaz (Ki) who has an Israelite King identifier, when he was in fact a King of Judah. AoM is a prophet, and the oversight will be corrected in the next REG update.
