Islam - caliph, Catholicism - ?

POPE
List of words for the clue Islam - caliph, Catholicism - ? from the crossword:
IMAM ALI ALLAH OMAR PRIEST ABU REL RABBI PROTESTANTISM PASTOR JUDAISM TSAR SWAYER RULER MUSLIM MOSLEM KHALIFAH KHALIF KALIPH
WordClue
IMAMcatholicism - priest, islam - ?
ISLAMpope - Catholicism, caliph - ?
RABBIcatholicism - priest, judaism - ?
CALIPHCatholicism - pope, Islam - ?
PASTORcatholicism - priest, protestantism - ?
PRIESTislam - imam, catholicism - ?
JUDAISMpriest - catholicism, rabbi - ?
RELIGIONchristianity or islam
CATHOLICISMcaliph - Islam, pope - ?
PROTESTANTISMpriest - catholicism, pastor - ?
GODDESSIsis or Bastet
PRIESTislam - imam, catholicism - ?