Really? Did Albert Einstein really believed in a personal God? Did he really believed in theism? Unfortunately, the answer to these two questions is NO. No, Albert Einstein did not believe in a personal God. Yeah, he believed in a god but not a personal god. He believed in Spinoza's God. And there's really big difference between the theist's god and Spinoza's God. And even if Einstein or any other famous and intelligent scientist or person believed in a God, that does not mean that we can already conclude that God exist. It simply does not follow and it is a very weak way of proving God's existence.
"The word God is for me nothing more than the expression and product of human weakness, the Bible a collection of honorable, but still purely primitive, legends which are nevertheless pretty childish." -Albert Einstein