Actually the primary choice is not between God and no God, but between monism and dualism. The earliest humans did not make a distinction between the physical and the spiritual, however Judaism, Christianity, and philosophy did. They introduced dualism of the physical and the metaphysical, which is the standard at least in the West today.
Atheism has gone back to monism, but this time it is physical monism. It can also be explained by taking Western dualism and subtracting the metaphysical from it. The problem with this is that it rejects the philosophical tradition of the West because it is found in the metaphysical.
You say you do not remember having a choice, accept for what I would call naïve realism. I wonder if you recall ever asking the Being Question. Why is there something or existence rather than Nothing?
Atheists used to philosophers like Russell, but now people like Dawkins and Hawking reject philosophy. It seems to me that if one says that only the physical is real, then the spiritual and the rational are not, because they are not physical.
If Reality were only physical, it would be simple, which it is not. We live in a complex Reality, where we need to work with many people who are diverse and complex. Science is very helpful dealing with our world, but not the complete answer for facilitating people to work together to help one another.