?
Well, first, I'll preface this with I have no real basis for this aside from things I've read about the guy and papers of his I've looked at.
Einstein was from a Jewish family... so obviously he had some religious upbringing.
He was also a scientist... His purpose was to unravel the Universe if at all possible... and he made some interesting theories and postulates regarding how life in this universe could have been created and put together.
My general feeling is that Einstein believed that the Universe by itself was someone "god-like"... the way it was formed... shaped... and continues to expand and develop (even to this day). I'm not sure he was "religious" in a sense that he followed a group of teachings from one group... but more he let his knowledge and science itself determine how he thought about creation and the like.
I think he was spiritual in that he saw the wonders of the universe and thought of how truly awesome the universe was, which in and of itself made him a spiritual person in regards to life.
That's just how I see it when i read about him, but that's just my opinion... lots of people disagree with me.