The hadith collections include traditional, hagiographic accounts of the verbal and physical traditions of Muhammad. In general, the majority of western academics view the hadith collections with caution. Bernard Lewis states that "The collection and recording of Hadith did not take place until several generations after the death of the Prophet. During that period the opportunities and motives for falsification were almost unlimited. According to Stephen Humphreys, while a number of "very capable" modern scholars defended the general authenticity of isnads, most modern scholars regard isnads with "deep suspicion". Brown asserts the hadith tradition is a "common sense science" or a "common sense tradition" and is "one of the biggest accomplishments in human intellectual history
Historicity of Muhammad
Criticism of the Quran - Wikipedia
Some Muslims accuse Christians of corrupting the Bible. While this charge would explain the differences between the Quran and the Bible, the allegation has no credible evidence. The Quran praises the Bible, and scholars verify the Bible's authenticity. The Bible is commended in the Quran Islam cannot teach that the Bible was corrupted before or during Muhammad's life because the Quran commends the Bible: The Bible is verified by scholars Since the Bible could not have been changed before or during Muhammad's time, the only other possible time for corruption was after his death.
Quran or Koran
What commends it Quran so powerfully to the historian is its authenticity, not as the Word of God, of course, as the Muslims believe but as the secular historian cannot and should not, but rather as a document attesting to what Muhammad said at that time and place, early seventh-century Mecca. It is not a transcript, however; our present Quran is the result of an edition prepared under the orders of Uthman Those Uthmanic clues are fragmentary, however, and large 'invented' portions might well have been added to our Quran or authentic material deleted.
God is one and unique; he has no partner and no equal. Trinitarianism, the Christian belief that God is three persons in one substance, is vigorously repudiated. The subdivision that is now predominant counts a total of 6, verses. However, this divine voice alternates with third-person statements about God. There are also narratives, some of which centre on biblical persons, such as Adam , Moses , Jesus , and Mary.