Well, let's go back through history. The Israelites were enslaved by those mean old Egyptians. Working with Moses, God freed them. Then they wandered around for 40 years, building up their numbers and raising an army. Then, they used that army to conquer and massacre. Yes, they would kill entire cities, men, women, children, and animals. But hey, it was ok because God told them to do it, and the Israelites were his chosen people. And maybe the people in those cities were like the gnostics believe - no permanent souls. So it wasn't as they invaded an established civilization and murdered their citizens. All they did was put down some animals. No harm there! If anything, the God of the Old Testament is more akin to the Allah of today's militant Moslems. Kill 'em all - it's ok with God.
There were isolated incidents wherein the inhabitants were killed but that does not compare to the history of Islam which gained power by murdering its way throughout the Middle East most of which was Christian and Jewish when Mo arrived on the scene. What was an exception was SOP for the Murderous Minions of Mad Mo.
If you want to review history keep at it and let me know what a religion based upon the idea that "Heaven is entered under and arch of Swords" is going to be like. Or that argues that you can Kill your way there as the Koran repeatedly tells us. Or which perverts the concept of martyr (one who is killed for his religion) into murderer (one who kills for his religion).
I encourage all to read the Koran if you have not it clearly illumines the inherent violence of Islam which is more a totalitarian political ideology than a religion in any case.