The split in Christianity into Eastern Orthodox & Roman Catholic and the split in Islam into Sunni & Shi’a are similar in that both were caused by… a) disagreements over who should be in power.
b) geographical differences.
c) communication problems due to language differences.

A)The answer is disagreements over who should be in power expl Sunnis and Shia split occured after the death of the prophet Muhammad 632 BCE. Shia believed that Ali should be the new leader of the muslims because he is in the same family as Muhammad. ... Hussein was then decapitated and his death is now a symbol to the Shia.

Because so many people use them and say that they are good