The following philosophical argument is based on the teachings of Dr. William Lane Craig.

God is the greatest conceivable deity that one can imagine. That is, if one has a conception of god and another has a greater conception of God, then the latter is God.  Why is this true?  If one can perceive a greater God, then the lesser god is imperfect. Both Islam and Christianity hold to this view. In both faiths God is omnipotent. No one can come behind and think of a more powerful God. In both faiths God is omnipresent. No one can think of a God who can be in more places. And, in both faiths, God is omniscient. No one can think of a God who knows more.

IN the Christian faith, however, God is all Loving. The apostle John even goes on to define God as love (not that love is god…as  some wackos hold). The God of the Bible loves unconditionally. We don’t have to do anything.

"...I pray that you, being rooted and established in love, may have power, together with all the saints, to grasp how wide and long and high and deep is the love of Christ, and to know this love that surpasses knowledge..."

Not so in Islam. God is not all loving. His love requires that one earns it through works and moral upright living. The Koran teaches that “God loves not the unbelievers, God loves not the evil doers, God loves not the proud…” The God of Islam loves conditionally.  Unfortunately, if the God of Islam is perfect, by definition, all who fall from his moral standards would be evil (different argument; different day). 

Therefore, the greater of these Gods is the God of Christianity.

Note:  Picture of my cat chilling is simply an appeal to emotion.