Medieval Christian polemic credited Muhammad’s doctrine to a Nestorian monk and Jews

Evidence

The classic statement is that of the Cluniac summula: ‘in order that the plenitude of iniquity should come together in Muhammad, and that nothing should be lacking for the perdition of himself or others, to the heretic were added Jews’. — Norman Daniel, Islam and the West, 1043 (#expands, via linked claim)

Both Alfonsi and the Liber denudationis portray Islamic ritual and belief as a confused hodgepodge of heretical Christianity, heretical Judaism, and idolatrous survivals. Both stress the role of Muhammad’s heretical teachers. For the Liber denudationis, they are the monk “Boheira” (i.e., Bahira), the Jew ‘Abd Allâh ibn Salâm, and the Persian Salmân al-Fârisî; for Alfonsi, Muhammad was educated by a Jacobite heretic named Sergius (who, he says, had been condemned by a council of Antioch) and by two Jewish heretics, Abdias (perhaps ‘Abd Allâh b. Salâm) and Ka’b al-Ahbâr. For this reason, both authors suggest, Muslim doctrine contains a mixture of truth and error, its ritual a blend of Jewish practice and paganism. — John V. Tolan, Saracens, 811 (#expands, via linked claim)

It seemed likely, not only that the Bahira of Muslim legend was the same as the Christian apostate whom Muhammad, in Christian legend, customarily consulted, but also that Islamic sources betrayed the hidden truth when they spoke of Muhammad’s retirement from the world just before the first revelation, in the hills around Mecca - this suggested that the time was really spent with the renegade, secretly preparing the details of the fraud. — Norman Daniel, Islam and the West, 1314 (#corroborates, via linked claim)

Categorization

• XREF: connects to: Medieval legends credited Muhammad’s revelations to a heretical monk; Medieval annotators traced specific Qur’anic verses to Arian and Nestorian heretical origins; Medieval polemic framed Muhammad as heresy plus Judaism combined — Norman Daniel, Islam and the West, 1043 (+16 more)

Broader Connections

• Medieval polemic framed Muhammad as heresy plus Judaism combined #expands (0.95) — Norman Daniel, Islam and the West, 1043
• Medieval Christian polemic traced Muhammad’s error to heretical Jewish and Christian teachers #expands (0.95) — John V. Tolan, Saracens, 811
• Early Christian polemicists accused Muhammad of fraud committed with a renegade monk #corroborates (0.95) — Norman Daniel, Islam and the West, 1314
• Medieval Christian polemicists explained Muhammad’s prophethood as demonic possession #complicates (0.85) — Norman Daniel, Islam and the West, 194
• Medieval Christian polemicists built their case on Muhammad’s alleged self-contradiction #complicates (0.85) — Norman Daniel, Islam and the West, 695
• Medieval polemicists used Jewish and Islamic scriptures to refute each other reciprocally #complicates (0.80) — Norman Daniel, Islam and the West, 311
• Medieval Christian polemicists judged Muhammad by Christian criteria for prophecy #complicates (0.80)
• Medieval Christians polemicists routinely conflated the Qur’an with reported sayings of Muhammad #complicates (0.75)
• Medieval Christian polemic began treating Judaism and Islam as parallel irrational faiths #complicates (0.75) — John V. Tolan, Saracens, 833
• Medieval polemicists conflated Qur’an and hadith authorship by Muhammad #complicates (0.75) — Norman Daniel, Islam and the West, 2225
• Medieval Christian polemics demonized Muhammad to justify crusader violence against Muslims #complicates (0.75) — John V. Tolan, Saracens, 886
• Medieval Christian polemicists framed Islam as lust-driven heresy rather than separate religion #complicates (0.75)
• Medieval Christian polemic weaponized Muhammad’s unascended body against his prophethood #complicates (0.70)
• Later medieval polemicists reproduced hostile biographies of Muhammad as heresy #complicates (0.70) — John V. Tolan, Saracens, 889
• Medieval Christians constructed Islam and Judaism as mutual templates #complicates (0.70) — Ivan Davidson Kalmar, Derek Penslar, Orientalism and the Jews, 235