While librarians tend to honor Hoenir or Hropt (the minor god of libraries), very few outside of the god’s temples are actually clerics. Similarly, Lorekeepers tend to be found in libraries as patrons, not as workers. Librarians range in disposition from helpful to surly, the latter variety having a strong dislike for filthy adventurers thumbing through “their” rare books with grubby fingers.
Librarians may have a Knowledge skill or two, but it is not required—their task is to look after the books, not read them. The great majority are literate, but in small libraries with few tomes, merely recognizing the cover and knowing the contents are enough to help visitors.