The three Abrahamic religions are Judaism, Christianity and Islam. Judaism and Christianity share the Old Testament, Hebrew Bible or Tanakh. The Koran is not the same as the Hebrew bible. A great deal of what is in the Old Testament is also in the Muslim Koran but Mohammed developed the stories differently. Naturally Muslims say the difference came from God and not Mohammed. Muslims see those who believe in other Abrahamic religions as better than Atheists Hindus and others who don't even share the Old Testament. Muslims are allowed to treat Christians and Jews better in this life. Those who don't believe in any Abrahamic religion are seen as Kafirs. According to Islam Christians and Jews are destined for damnation unless they convert to Islam well before they die. Kafirs similarly must convert in good time or be damned.