Answer:
Cause they dident like each other simple as that. Lol :)
Step-by-step explanation:
'Christianity and Islam share the paradox of being religions that claim to be ... God and leads in turn to Judaism, Christianity and then historical Islam as proclaimed ... G.G.: How does this compare with the Sunni traditions? ... G.G.: Many people are puzzled at the violent conflicts between Shias and Sunnis.