Humans are naturally inquisitive and logical, so one could say that they are born with a scientific outlook. However, humans are also naturally emotional and socially sensitive, so one could say that they are born with a religious mindset. I don't believe that the tendencies are mutually exclusive, though it seems that different personalities tend to favor one or the other. As for deities and spirituality, different theologies can vary greatly, so some may appear to be more logical than others. I view them as both real and subjective: if it works for you, it's as valid as solid ground, but only for you. I am not a subscriber to the belief that there is one true religion or god, so I find the subjectivity of religion evident in the great diversity of its various incarnations around the world and throughout history. To me, they are all different ways of approaching the same issue regarding the nature of our own existence. A society can use this issue as the cornerstone for its entire culture, and when this happens, it becomes a religion. My short answer, then, is that while spirituality is in some way a basic individual need for every human, religion is a social invention. This notion rings true even among staunch atheists, who often, in a sense, use the teachings of the scientific community as their religion and empiricism (more often in its popular connotation than the formal one) as their spirituality.