Summary
Can God exist? Note that this question isn't asking if we believe that He exists. It only asks the question - do you think it is even possible that God, a being of maximal greatness, can exist?If you think there is even a possibility that God can exist, then you can conclude that God does exist! This is the profound conclusion of the Ontological Argument, and it is as simple as that. If you believe it is possible that God can exist, then he must exist necessarily.