Independently studying Hadith compilation
Q: Recently I have been doing a lot of research on hadith compilation as a result I was introduced to a new subject in Islamic history. Honestly this is something very new for me, I didn’t know that there existed so many different schools of thought like Murijites, Khawarijites, Mutazilites and the Ahle Sunnah who are in modern times also identified as the Orthodox or Traditionalists. Furthermore if I am not wrong, each school was declaring the other group as kafirs because of competing viewpoints.
Can one group consider the other to be out of the fold of Islam?