Not a bad summing up really. And your final comment is more profound than you may realise...
It is not so much the religious aspect per se, as many if not most religious writings are promoting peace and harmony and encourage doing good to one's neighbour.
The problem is with the human race in toto. People tend to be greedy, and money/power hungry and will sieze upon any good excuse to gain such, and with Man's inherent spiritual nature, an inbuilt need to believe in a higher power, religion is a perfect means to achieve that. It wasn't just religious leaders who wanted the gerneral populace to remain ingnorant in order they could control them, politicians, ie: Kings, Emperor's, etc. preferred this and actively used their power to supress in order to maintain their position.
When the Jews actually lived according to their scriptures, they were prosperous and had peace between them and their surrounding neighbours and internal peace each one. Finances were organised fairly and no-one was left permanently indebted, heritances were preserved and women and children were respected and cherished.
Unfortunately, too often their greed and avarice won out over law, and finally when they murdered Christ they were rejected as the People of God. However, the Jewish nation refused to accept Christ and maintain they are still God's Chosen Nation. They remain in expectation of the Messiah right through to today.
Man is more than capable of Genocide and murder and nationalistic fervour and hatred without religion, as history shows. But certainly organised religion is due its comeuppance and it won't be too far away either. But that's for another thread...

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