Even smart people can be mystified (I think Einstein said something along those lines, when asked if he 'believed in god'...they chose to reinterpret his answer as a resounding yes, but he was saying something more subtle than 'i believe in a Christian God'.)
I am familiar with the Einstein quotes. When he spoke about "god" he spoke mainly in an abstract sense of "The Laws of Nature."
When people took his quotations out of context, he made is opinion explicitly clear:
"It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. I do not believe in a personal God and I have never denied this but have expressed it clearly."I've heard that he wasn't explicitly an atheist either but, if anything, probably a Deist.
http://wiki.ironchariots.org/index.php?title=DeistBut I'd also like to point out that whatever Einstein believed is irrelevant. Einstein's opinions are only relevant when it comes to the subject of physics. Sure, he was very intelligent -- He turned the world of physics upside down -- but it's often the scientists who are the easiest to fool (as James Randi often points out).
Science has a way to counteract this, though. It's called the double-blind experiment.
That shouldn't over rule common sense, though. That'd be why I'm an atheist.
I whole-heartedly agree

(and I speak about the heart in the metaphorical sense, not literal as some people believe)