No Catholic should believe in the evolution of the human body.
There is no accepted theory of the evolution of the human body from any lower form of life which will allow that only one man evolved, and that the whole human race originated from the body of that one man. Hence, evolution, basically and completely, denies defined Catholic Faith.
There is not a single evolutionist who will allow that the body of the first woman was formed from the body of the first man. but it is of the Faith, from clear Scripture, that this is so. Were the evolution of the human body to be effected from the body of an ape, it would be required of a human soul that it fulfill the double function of "de-aping" the animal and establishing the man. No Catholic thinker of any sanity could possibly explain a substantial form in such a performance. The theory that the human body might have evolved from the body of an ape vitiates and destroys all true notion of Original Sin. There is no allowance in it for the preternatural gifts of immortality, impassibility, and integrity with which the first man was endowed.
A belief of any kind in the evolution of the human body from a lower animal makes one completely skeptical of the narrative of the first chapter of Genesis. It immediately drives one to speculate on the age of the world in terms of millions and even billions of years.
The theory of evolution gives Our Blessed Lord and Our Blessed Lady, both, a simian ancestry.
Any Catholic who believes in the evolution of the human body does not have the Catholic Faith. His heresy will some day be anathematized by a courageous pope.
- Fr. Leonard Feeney