Polemics could condemn a rival religion using only its own scriptures

Evidence

The Qur’an, he continued, confirmed the authority of the earlier Testaments as prior to its own, ‘not only for the past, but for the present’. By guaranteeing the Scriptures, it invalidated itself, and yet, ‘so far as the visions of such a man could’, its confirmation of the Scripture held good. — Norman Daniel, Islam and the West, 298 (#exemplifies, via linked claim)

The Rabbi Samuel letters, which were put into Latin only in the middle of the fourteenth century, were asserted by their translator to have long circulated in Arabic among Christians. Their originality was to interconnect the mutual verification of the Three Laws: that is to say, both Rabbinic teaching and the Qur’an confirm the truth of the Gospel, while each of them destroys the claim of the other. Islam taught the Rabbis that Jesus Christ is the Messias, while the Jews made the Muslims understand that Muhammad was neither Messias nor Paraclete. — Norman Daniel, Islam and the West, 311 (#exemplifies, via linked claim)

But he also wrote the lengthy and rancorous Kitab al-Fisal fi-al-Milal wa-al-Ahwa’ wa-al-Nihal, or ‘Book of Distinction in the Religions, Heresies, Sects’, in which he sought to demonstrate the superiority of Sunni Islam to all other faiths and sects. … According to Ibn Hazm, Christians had tampered with the New Testament and removed prophecies concerning the coming of Muhammad. They corrupted the Gospels with lies. ‘All this shows the Christian community is altogether vile.’ — Robert Irwin, For Lust of Knowing, 80 (#exemplifies, via linked claim)

Categorization

• XREF: connects to: Each religion saw the other as a corruption of its own truth. — Norman Daniel, Islam and the West, 1039; Medieval polemicists used Jewish and Islamic scriptures to refute each other reciprocally — Norman Daniel, Islam and the West, 311; Medieval Christian polemicists uniquely claimed proof via another religion’s scriptures — Norman Daniel, Islam and the West, 297 (+5 more)

Related

• Medieval polemicists used Jewish and Islamic scriptures to refute each other reciprocally (similarity 0.90)
• Muslims held that Jews and Christians corrupted their scriptures (similarity 0.88)
• Protestant-Catholic-Islamic parallels in polemic relied on incredibly thin points (similarity 0.88)
• Each religion saw the other as a corruption of its own truth. (similarity 0.87)
• Christian polemicists argued the Qur’an’s own endorsements invalidate it (similarity 0.87)
• Medieval Christian polemicists uniquely claimed proof via another religion’s scriptures (similarity 0.86)
• A polemical work made Jews and Muslims mutually undermine each other’s scriptures (similarity 0.86)
• Medieval anti-Islamic polemic read the Qur’an’s own approval of the Bible as self-invalidating (similarity 0.84)
• Muslim polemicists accused Christians of corrupting scripture and polytheism (similarity 0.84)
• Medieval Christian polemicists treated Islam as closer to true faith than Judaism. (similarity 0.84)
• Medieval authors mislabelled Islamic Christian and Jewish influences as heretical sects (similarity 0.84)
• Mediaeval anti-Islamic polemics convinced neither Muslims nor Christians (similarity 0.83)
• Medieval Christian polemic framed Islam alongside heresy and Judaism (similarity 0.83)
• Medieval Christian polemicists attacked Islam with knowingly false evidence (similarity 0.83)
• Medieval polemicists distinguished what Muslims believed from what they only thought they believed. (similarity 0.83)

Broader Connections

• Medieval polemicists used Jewish and Islamic scriptures to refute each other reciprocally #exemplifies (0.95) — Norman Daniel, Islam and the West, 311
• Christian polemicists argued the Qur’an’s own endorsements invalidate it #exemplifies (0.95) — Norman Daniel, Islam and the West, 298
• Muslim polemicists accused Christians of corrupting scripture and polytheism #exemplifies (0.85) — Robert Irwin, For Lust of Knowing, 80
• Christian polemists preferred their own readings over traditional Islamic interpretation #expands (0.80)
• Later polemicists distorted early scholarly accounts of Islam for propaganda purposes #complicates (0.80) — Norman Daniel, Islam and the West, 1208
• Medieval Christian polemicists uniquely claimed proof via another religion’s scriptures #qualifies (0.75) — Norman Daniel, Islam and the West, 297
• Identical source material can yield opposite religious impressions #expands (0.75)