" Several themes that are common in early non Muslim sources but far less so in sources from the Arabo-Islamic tradition feature prominently in al-Zuhrī’s account. For instance, al-Zuhrī portrays the ascendance of Muhammad’s followers: (1) as led by a new king (malik), or else as ushering in an era of new kingship/dominion (mulk); and (2) as primarily an ethnic dominion, being a rule not of a community of faithful believers (al-muʾminīn) but rather of “the circumcised people [al-khitān].” While this is not incompatible per se with early Islamic historiography, these themes deeply resonate with early Christian accounts of the rise of Islam, particularly in the Levant, which most often speak of the new Arab/Saracen rulers in terms a new dominion (Syr. malkūtā), not a new religion and hence just as often depict Muhammad and other early Muslim rulers as merely “kings” (Syr. malkē) and nothing more. The account of Ps.-Fredegar fits this pattern perfectly, inasmuch as it describes the “circumcised” conquerors in purely ethnic terms, designating them as either Hagarenes (Agarrini) or Saracens (Saracini), but displays no knowledge of Muhammad, his religion, or the religious convictions and motivations of the “Saracen” conquerors. "
― Sean Anthony , Muhammad and the Empires of Faith: The Making of the Prophet of Islam