All arabic Tribes were nomadic.
Tribal conflict was a part of life.
Each tribe had their own methods to protect themselves and their children and family groups.
'Us' and 'them' defined good/ evil ; friend, foe.
Fertile land became scarce after clearing it for firewood and after being grazed by their goats etc.
Particularly when people settled down and started farming they needed to protect their 'property' from outsiders.
Having faith in a God defined one group from other groups.
Each group believes their own prophet or messenger speaks the word of God and therefore the Truth.
The wonderful global cultural heritage from India to Africa to the ME to Europe to Russia show how world religions have shaped the way of life, food, art, buildings, beliefs, history and language of the world's people.
It's pure arrogance to believe one religion is better than anyone else's and contributes to intolerance and 'othering'.
Being judgemental and intolerant breeds hatred.
Humans don't seem to be able to see a connection between their own day to day behaviour and its impact.
Nothing has changed. Over 2000 years of never practicing what you preach.