Hadīths

1) Prior probability of false ascription in religious-historical material

2) The earliest extant collections were recensions from the ninth century onwards

3) Hadith are full of contradictions

4) A large number of hadith suspiciously look exactly like later religious sectarian, political, tribal, familial, and other partisan, polemical and apologetic creations

5) Hadith talking about later terms, later institutions, later events, and later phenomena.

6) Putative supernatural explanations for texts have a vanishingly low prior probability of explaining the existence of these reports

7) Reports of mass fabrication

8) Isnads rose relatively late, and became widespread even later

9) Early usage of the word Sunnah was a generic notion of sunnah as good practice, which was not specifically Prophetical, and was independent of hadith

10) A rapid numerical growth in hadith can be observed

11) Absence of Hadith in early sources

12) Retrojection of hadith; ratio of cited hadith changes from mostly ascribed to followers then to companions then to the Prophet

13) Various peculiar correlations, descriptions, and content that don't make sense as a product of genuine historical transmission but make more sense as a product of later debates and later ascription preferences

14) Hadith contradicting earlier literary and archeological sources

15) Orality means less precision in transmission

16) Extreme variation, early rapid mutation and distortion across the hadith corpus

17) Artificial literary or narrative elements; Recurring topoi

18) Hadith exhibit telltale signs of storyteller construction

19) Exegetical reports about the context of the Quran are exegesis in disguise

20) Recurring disconnect between the Hadith and the Qur'an in terms of historical memory

21) There was no effective method for distinguishing between authentic and inauthentic hadith