What you are asking about is called the mind-body problem: What is the relationship between myself and my body? The following quote could have been made by Richard Dawkins, Daniel Dennett, and all the other professional atheists:
And certain properties of the human brain distinguish our species from all other animals. The human brain is, after all, the only known collection of matter that tries to understand itself. To most biologists, the brain and the mind are one and the same; understand how the brain is organized and how it works, and we’ll understand such mindful functions as abstract thought and feelings. Some philosophers are less comfortable with this mechanistic view of mind, finding Descartes’ concept of a mind-body duality more attractive. (Neil Campbell, Biology, 4th edition, p. 776 )
I went to a Catholic college and am intelligent enough to grasp and formulate four solutions to the mind-brain question: 1) Dualism (spiritual substances exist), 2) Materialism (the mind is an illusion), 3) Idealism (the brain is an illusion), 4) It is a mystery.
# 4 is the theory judged to be true by rational people. This is why humans are embodied spirits. There is more evidence for # 2 than for # 1, but there is even more evidence for # 3. Atheists only grasp # 1 and # 2. They fail, not at the level of reflective judgment, but at the level of intelligence.