Alright, put on yer larnin' hat. Since the Jewish inception,Jaweh is one of the many names they gave their "God". In the old testament Abraham took a slave to get a  son, and Ismael was born. Then, unexpectedly his wife, had a son.  She had been sterile for 40 or so years. And she had a son and named him Iassac.  She did not want to compete with the slave girl. nor her son with Ismael.So she condemned them to death.  Abraham snuck them out and helped them to escape. Then.   while Jesus of Nazareth came later, they called themselves Christians and worshiped God. The same one the Jews worshipped.  400 years after Christ, Muhammed, the ancestor of Ismael, the slaves son.  came along and started Islam.  Around 700AD they took control of the middle east by war and offering to all "convert or die". They split into two factions, Sunni and Shiite, each believe the other worthy only of death, as they do any infidel, like you and me. Thats the short version.