One could argue to an eternity over what the beliefs of some of the world's past and present brilliantscientists were, whether they are based on reason, and if their views are important.

There is no doubt that one would find a wide range of views among these scientists, if you could accurately determine their personal views at all.

While these top scientists followed their intellects and scientific curiously to amazing discoveries, I suspect their intellect alone adds little new insight into the existence or lack of a God. The main findings would likely be that these people spend their lives studying a complex and amazing universe, and, don't put much importance on focusing on whether there is or not a God.

So, with relatively normal brainpower and todays resources available to us, IMO, it comes down to a personal belief...a belief reached by what each person has learned from family and friends, combined with our current reasoning, leads to each personal choice on what works for each person. This should not be confused with a lazy personal choice, accepted blindly, as some put forward in attempts to belittle a personal belief in a God.