His mid-1950s pamphlet, called "Whirling Wheels: A Correlation of Flying Saucers and Visitors from Other Planets in The Bible," on the other hand, is a rich text replete with claims that would be repeated time and again in the developing von Daniken strain of the ancient astronaut theory.
I've posted extensive excerpts of the pamphlet in my US Government Ancient Astronaut Files section as well as a link to the FBI's copy of the full pamphlet.
Just imagine the audacity of Miller's claims for a 1950s audience: "To understand our own holy book we must replace outworn mythological terminology of yester-year with the most adequate scientific terminology of today." This much is what von Daniken would do a decade later. But then it gets good. Miller claims that Americans should remain Christians because God, Jesus, and the angels were all extraterrestrials. "This clear understanding of things as they are and as they will be, is for our comfort. We should always remember that God’s people are always protected by a circle of space-ships."
Compare this message with these delivered by Erich von Daniken, Giorgio Tsoukalos, and David Hatcher Childress. The general sentiment is the same, but it's astonishing how religious belief has so changed since the 1950s that alternative theorists have had to retrench from claims about Jesus as an alien to avoid offending increasingly adamant fundamentalists.