Hadith and Quran
In the name of Allah , most gracious most merciful
Muhammad(pbuh ) said:
''If you hear something from me against the Quran , it is not true .''
Because of that there are some groups in islam which reject all hadith .
We do not reject all hadith but if there is a conflict between Quran an hadith , Quran is ultimate source .
Another thing you are ignoring :
Quran does not only prove authenticity historically but also mathematically .
This feature is like a checksum in a Software .
http://powerpassion.net/?life/truth/checksums.html
The Certain Truth:
Checksums in the Holy Qur'an
Quran is the living miracle
Regards