1- the main idea of shiís and suni’s part:  even through there is a significant tension between shi’is and Suni’s that most ferquently leads to war, it is very clear from the article that both of them are considered Muslims but different types of thoughts.

2- both Sunni and Shiite Muslims acknowledge the Quran and the lessons of the Prophet Muhammad as the premise of their religion. However the interpretation differs from one school to another