Alternate title: How great does your God love?
In Christianity, we are introduced to the unconditional love of God, who desires that all come to salvation [I Timothy 2:4]. In Islam, Allah orders the death of the unbelievers [Quran 9:5]. Because of this, the love of the Christian God is simply greater than the God of Islam. And if the Christian God is greater than the Muslim God, and we define God as the greatest conceivable being. Therefore if the Christian God is greater than the God of Islam, the God of Islam is not God at all.