There are three types of Hadeeth, Un-Authentic Hadeeth, Valid Authentic Hadeeth and Invalid Authentic Hadeeth.

1>    Un-Authentic Hadeeth
Most of the Muslim Scholars are totally aware of the Un-Authentic Hadeeth, and these must be DELETED / REMOVED from all the books of Hadeeth to reduce the confusion among Muslim Ummah.

2>    Valid Authentic Hadeeth
Most of the Muslim Scholars are totally with the Authentic Hadeeth which do not contradict the Quraan and these are one of the real essence of Islaam.

3>    Invalid Authentic Hadeeth
This is the main driving key for all the divisions in Islaam, although are VERY FEW of the Hadeeth, may be less than 1%. These must be re-analyzed and FIXED or REMOVED from all the books of Hadeeth to reduce the confusion among Muslim Ummah.

Main Reason for Invalid Authentic Hadeeth Contradiction the Quraan:

In the Quraan Allah mentioned, that He replaced few verses of the Quraan, with similar or better verses (Al_Quraan_002.106, 016.101, 087.006-007). Now no one knows those old verses except for few like the commandments about consuming alcohol, since those were completely DELETED / REMOVED from the Quraan or all the scholars have taken the final statement i.e. alcohol is forbidden in Islaam completely as guided by the Quraan and there is a clear wisdom that one has to leave some of the bad habits in stages. However that is not true with the Books of Hadeeth, that is one of the reason, why you see although the narrations are ok, but few Hadeeth are still contradicting the Quraan. That is the only reason why, few of the Authentic Hadeeth are Invalid, BUT those Hadeeth need to be DELETED / REMOVED from all the book of Hadeeth.

Also the Quraan was revealed in stages during a period of around 23 years (Ref: Al_Quraan_076.023). It may have been possible that before any verses were revealed in the Quraan on any specific issue of any punishment for any crime, people of the book might have presented their laws from their Holy Books, which included Torah (Old Testament), or Injeel (New Testament), or Zaboor (Book of Psalms) and since those were also Book of Allah, although people have changed them, and Rasool Allah (Peace-Be-Upon-Him) might have given decision ONLY to the people of the book (Jews & Christian) of their believe. An example of that could be Stone to death for the Punishment for Adultery, which later Quraan clearly mentioned that regardless of any discrimination of status, gender etc., punishment of Adultery is hundred lashes. (Ref: AL_Quraan_024.002)

Also when Great Muhadditheen of Islaam like Imaam Bukharee or Imaam Muslim were collecting Hadeeth, it was really possible that Munafiqeen (Hypocrite) of that time, who were unable to alter the Quraan, since it is protected by Allah, managed to present in an intelligent way, which might have confused Great Muhadditeen of Islaam and who included those as a human error. Allah protected the Quraan and Quraan only.

Similarly we need to do more research on each and every Invalid Authentic Hadeeth and DELETE / REMOVE those from all the books of Hadeeth which contradict the Quraan.

Ali (RA) narrated, Prophet Muhammad (Peace-Be-Upon-Him) said, there is NO DOUBT that, there will be Hadeeths coming after me, claiming that I have said those. So you MUST test each and every Hadeeth from the QURAAN. If it is really according to the Quraan ONLY then you ACCEPT it otherwise REJECT it. (Sanan Dar Qatni, Vol-2, Book – Imrani Abee Musa, Matba Farooqi – 513)

None argue concerning the revelations (Ayaat) of Allah BUT those who Disbelieves ... (Al_Quraan_040.004).

Those who don’t read the Quraan with understanding/translation and Practice on Allah’s commandments are like ASS/Donkey carrying books, (Ref: Al_Quraan_062.005).