Ummah is not a simplistic Muslim political bloc in the Qur’an & Hadith. It is used at times to mean the faithful, as in the verse, “You are the best nation” (Al-Imran or the Family of Imran), although even Umar was said to have held the view that this referred primarily to the Companions.
Sometimes in the political sense it does not imply folk of one religion only, but rather society as a whole, composed of different religions – as in the Sunnah description of the Jews and Muslims of Madinah as one Ummah (nation), separate from all other nations (ref: the Mithaq or Covenant of Madinah). [The Spittoon] Read more