The Druids believe that the Christians and all other faiths worship the same divine being. That faith and belef impart reality. Mat doesn't really want to debate the validity of this claim, but he'd be lying if he said he didn't find it very intriguing. Three quotes to make you think about it:
"For as much as we are the offspring of God, we ought not to think that the Godhead is like unto gold, silver, stone or any image graven by art, device or the imagination of the man," the Apostle Paul.
"When we try to reach the Infinite and the Divine by means of mere abstract terms or images, are we even now better than children trying to place a ladder against the sky?" Aristotle.
"There is no God but what cannot be comprehended. There is nothing that cannot be comprehended, but what is not conceivable. There is nothing not conceivable, but what is immeasurable. There is nothing immeasurable but God. There is no God but what is not conceivable," Druid proverb.
Taken from Lady Pendragon Vol.2, #2