Arguably organized religion has been the vessel that the forces you mention act through, IE manifest destiny in NA, the crusades, the split between Catholicism and Lutheranism and the wars that were sparked from that moment, Pogroms committed against Jews for centuries, The Holocaust. You are probably correct though these psychological tribal instincts would continue even without organized religion, but damn it seems that is has exacerbated the problem. And even back in the middle ages in the height of these religious conflicts there was still some sense of respect for your enemies, while wholesale slaughter was not impossible, the taking of slaves was still seen as more humane than just slaughtering those who share a different religion than that of yours. Now the messages of hate are not directed against the power structures that use the religion as a shield, but against the common people that make up that religion. Vilifying the civilian population as complicit and therefore prone to acceptable reprisals in the name of God is a dangerous game and one that cannot be settled with diplomacy.