There are three main problems with Hadiths.
1. The Quran does not approve of them
2. They are not the Word of God
3. They are unreliable
31: 6 Among the people, there are those who accept baseless hadiths to mislead from the path of God without knowledge, and they take it as entertainment. These will have a humiliating retribution.
This is where Islam went terribly wrong, relying on Hadiths instead of the Quran only.
Soon after Muhammad's death, thousands of hadiths (words attributed to Muhammad) were fabricated and two centuries later collected, and centuries later compiled and written in the so-called "authentic" hadith books:
to support the teaching of a particular sect against another (such as, what nullifies ablution; which sea food is prohibited);
· to flatter or justify the authority and practice of a particular king against dissidents (such as, Mahdy and Dajjal);
· to promote the interest of a particular tribe or family (such as, favoring the Quraysh tribe or Muhammad's family);
· to justify sexual abuse and misogyny (such as, Aisha's age; barring women from leading Sala prayers);
· to justify violence, oppression and tyranny (such as, torturing members of Urayna and Uqayla tribes; massacring the Jewish population in Yathrib; assassinating a female poet for her critical poems); etc
Hadith and the Corruption of the great religion of Islam | Submission.org - Your best source for Submission (Islam)
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Quran.