The crazy thing about this reform movement is that if someone actually rejects an authentic hadith that person becomes a disbeliever. Also if someone denies something about the Quran or Prophet (peace and blessings of Allah be upon him) then he becomes a disbeliever. With the important condition that its something definite.
Islam does need reforming muslims do. If someone is lazy then just admit your laziness, I would respect you more but to try to change the religion then some of them are following the Christans out of faith into Athiesm and will become disbelievers without knowing it.
