Well it basically all started when Noah got naked and drunk. His youngest son Ham made fun of him. Noah didn't take that well and exiled him. This led to Gentiles vs. Hebrews/Jews Feud. Then there was Isaac and Ishmael. Now while Isaac did trick Ishmael for the inheritance and Ishmael was ticked off, they eventually made up and thus began the issues between Arabs and Hebrews/Jews. . .then one day a few thousands later Muhammad and basically turned it all into a giant family feud that's still going on today.