When scientists use the word God, they usually mean the God of Order. For example, one of the most important revelations in Einstein's early childhood took place when he read his first books on science. He immediately realized that most of what he had been taught about religion could not possibly be true. Throughout his career, however, he clung to the belief that a mysterious, divine Order existed in the universe. His life's calling, he would say, was to ferret out his thoughts, to determine whether he had any choice in creating the universe. Einstein repeatedly referred to this God in his writings, fondly calling him "the Old Man." When stumped with an intractable mathematical problem, he would often say, "God is subtle, but not malicious."
Source: Hyperspace : A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimens ion, Pages: 331
Contributed by: ~C4Chaos