I am relieved to hear Tim Keller talk about this, when I watched his feature before Google employees last year. Here is the part that I am glad he put down in words what was at the back of my mind:

A common analogy is often cited to get the point across which I am sure you have heard — several blind men trying to describe an elephant. One feels the tail and reports that an elephant is thin like a snake. Another feels a leg and claims it is thick like a tree. Another touches its side and reports the elephant is a wall. This is supposed to represent how the various religions only understand part of God, while no one can truly see the whole picture.

To claim full knowledge of God, pluralists contend, is arrogance. When I occasionally describe this parable, and I can almost see the people nodding their heads in agreement. Ironic isn’t it?  The position is intellectually inconsistent. (Tim Keller) 

Full article which this is excerpted can be read here.