The book that made an impact on my parent's life

The book that made an impact on my parent's life is the book called 'Chariots of the gods.
This is the summary of the documentary which has originated from the book:
The German documentary Chariots of the Gods attempts to lend credence to the speculative best-seller by Eric Von Daniken. Using the most tenuous of evidence -- pyramids, curiously plowed farm fields, obscured-origin artifacts -- Von Daniken strived to prove that mankind's ancient civilizations had been visited by extraterrestrials. American documentary producer Alan Landsburg bought the US rights for Chariots of the Gods, transforming it into a more compact TV special, In Search of the Ancient Astronauts. Landsburg also replaced the German film's narration with the cadences of Twilight Zone mentor Rod Serling.
Source: Hal Erikson, (Date Not stated). Fandango. Retrieved June 25, 2009, from Chariots of the Gods sypnosis Web site: http://www.fandango.com/chariotsofthegods_v8930/summary
My parent claimed that it changed his way of viewing religion after reading the book, but did not elaborate.