Mr. Einstein thought that the concept of a personal God was childish but as an agnostic did not rule out the possibility of the existence of a consciousness and intelligence which is presently beyond our comprehension that is responsible for the creation and laws of the universe. I think that means he didnt claim to know about God. I dont think that makes him a Pantheist I think that makes him and agnostic.The original letter from Einstein was posted on this and is available to view:
The word God is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honorable, but still primitive legends which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this. These subtilised interpretations are highly manifold according to their nature and have almost nothing to do with the original text. For me the Jewish religion like all other religions is an incarnation of the most childish superstitions. And the Jewish people to whom I gladly belong and with whose mentality I have a deep affinity have no different quality for me than all other people. As far as my experience goes, they are also no better than other human groups, although they are protected from the worst cancers by a lack of power. Otherwise I cannot see anything 'chosen' about them.
"The religion of the future will be a cosmic religion. It should transcend personal God and avoid dogma and theology. Covering both the natural and the spiritual, it should be based on a religious sense arising from the experience of all things natural and spiritual as a meaningful unity.- Albert Einstein