Muslims, you believe in Mazhab or Deen?

Madhab is innovation ,Bid'ah invented after the demised of the Prophet and,his companions ,No way in the Quran or Hadith teach us to follow any of these Madhab ,Madhab has bring division in this Deen , yes Fiqh is part of deen ,do you know where is the source of Fiqh ?every Islamic laws is fiqh