{ Fight in the cause of Allah those who fight you, and do not transgress; indeed Allah does not love those who transgress. And kill them wherever you get to them, and drive them away from where they drove you away; sedition is more severe than killing. But do not fight them at the Sacred Mosque until they fight you there, then if they fight you, kill them; such is the retribution of the Disbelievers. If they cease, indeed Allah is forgiving and merciful. And fight them until there is no more sedition and religion belongs to Allah; and if they cease, there is no hostility except against those who oppress } Al-baqara 190-193

{ Sedition is more severe than killing } : this means that in the sight of Allah Mighty and Sublime, shirk is a greater crime than killing.