But it really, really isn't. For example, the Jizya tax is something employed on Christians and Jews living in Muslim lands - if the rule was to kill those of other faiths, they would not have such a tax recommended in the Qur'an. That's not to forget the historical evidence - Muslims have never attempted to 'purge' the Middle-East, a famously multi-faith area, of non-Muslims. Even today, polls support religious freedom for non-believers across the Muslim world. Your assertion that the Qur'an calls for non-believers to be killed is honestly a total fabrication.