That is a fascinating and deep question. I think that the genes recently found correlating, to a belief in God or atleast a higher power/cause plays part of the role. We also seek after God because as thinking, sentient beings we cannot answer everything with science or our own empircal methods. Religious beliefs and spiritual ones independent of religion go back tens of thousands of years and is therefor part of our evolution. Interestingly enough too, recent experimental evidence points to the possibility God in fact does exist. One scientist has calculated that the probability of God's existence is greater than chance (>50%) at around 65%. I would say then as a scientist who has faith, God is sought because he exists to be sought:)Even when I feel good and confident in my decisions,I still seek God myself. Happy hubbing!