Islam will struggle to exist without the hadith (The sunnah as I referred to earlier). The vast majority of muslim's (Choose whichever sect you wish dude) will not dispute sahih (authentic) hadiths as they are an integral part of the religion, explaining further in detail the commandments of Allah (swt). This is what makes Islam unique from a scripture perspective to the previous scriptures (i.e. Torah and Bible) - We muslims have context for the words of God. Prime example of this is prayer - The Qu'ran tells us to pray 5 times a day. Nowhere in the qu'ran (other than saying to bow your heads in worship) does it say HOW to pray. That is all based upon the Sunnah of the prophet Muhammad (pbuh). Look at the way ALL muslims pray - it is very similar no?...... What you are referring to is what some consider to be weak hadit (not 100% authenticated like Sahih ones are ) - yes these can be subjects of contention - but they do not impact on the overall principles of Islam.