Teeter, E. & Brewer, D.J. (2002). Religion in the lives of the ancient Egyptians.
"Because the role of religion in Euro-American culture differs so greatly from that in ancient Egypt, it is difficult to fully appreciate its significance in everyday Egyptian life. In Egypt, religion and life were so interwoven that it would have been impossible to be agnostic. Astronomy, medicine, geography, agriculture, art, and civil law--virtually every aspect of Egyptian culture and civilization--were manifestations of religious beliefs" (From the first paragraph).