Salaam,
The only source of Islam is the Quran. How can anyone trust or give creditability to an author (s) or sayings who's writings are guessed to be accepted to be the truth or not. Most importantly, Allah says not to go by anything but the Quran so why would someone who follows Islam go against what Allah says vs a man who you never met?
It is still considered Idolization because people are obsessed with Prophet Muhammad and think he said any of this rubbish stuff. Muhammad NEV ER taught anything but the Quran. It is in the Quran, Allah's words, every single one of them, that Muhammad received and taught. Islam is not about prophet Muhummed, it is about Allah and his words. So how can Muhammad have gone against Allah's word? Sounds silly doesn't it?
Everything is in the Quran.. It is complete and has everything any human God created will need. If something is not in there, our Creator knows best why it is not needed. Besides the Quran, NOTHING is part of Islam. Muhammad did not invent Islam. His missionary was to reveal and preach what was revealed to him.
I attached Brother Joseph's link that explains all this..
Salam
http://quransmessage.com/articles/hadith%20FM2.htm