I’ll answer your second question — essentially Protestants are those who have rebelled against the authority of the Apostolic Church. The Orthodox and Orientals or Assyrians are not Protestants for that reason. Among the protestants groups, the Anglicans and Lutherans WERE close to Apostolic teachings (many of the sub-groups among those are still in Apostolic teachings but not the entire groups), while Baptists, Presbyterians, Methodists, Wesleyans, Mormons, Assembly of God, Jehovah’s Witnesses, Anabaptists, Calvinists, Arminians, etc. aren’t.
I do not know of any church that has Protestants in their name. So how are they like non denominationist protestants?