Real world priests not only played favorites extensively, but most cultures expected you to play favorites. Patron gods for specific cities (and the priests who worshipped them) were a global thing, from the Greeks, to the Babylonians, to the Chinese, to the Aztecs, to the Hindu, to the Incas, to the Yorubans.My cleric hews more closely to real world priests, in that each one is a servant of all his culture's gods and is not supposed to play favorites.
Can't say I'm familiar with Pendragon, how does it do alignment?