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Science fiction often portrays real religions being exported to alien planets
Despite the long history of conflict between the disciplines of science and religion, the literary genre known as science fiction sometimes addresses the topic of religion. Some stories use religious themes to convey a broader message, but others confront the subject head-on—contemplating, for example, how attitudes towards faith might shift in the wake of ever-advancing technological progress, or offering creative scientific explanations for the apparently mystical events related in religious texts (gods as aliens, prophets as time travelers, etc.). As an exploratory medium, science fiction rarely takes religion at face value by simply accepting or rejecting it; when religious themes are presented, they tend to be investigated deeply.
In Out of the Silent Planet (part of the Space Trilogy), by C. S. Lewis, the protagonist meets "eldila", mysterious beings of light native to the void of interplanetary space (who are actually what Christianity defines as "angels", and who are also identified as Mars, Venus and other deities of Greek and Roman mythology), and are completely loyal and obedient to God, and have never wanted to be worshiped as gods themselves (although the ancient Greeks and Romans mistakenly did so)
In the film Blade Runner, Roy Batty is an artificial person looking to confront his creator, while Rick Deckard searches for lost humanity despite his job: hunting and "retiring" drapetomaniacreplicants
The 2006 Doctor Who episodes "The Impossible Planet" and "The Satan Pit" feature an ancient being known as the Beast, which claims to be the basis of the Devil figure in all religions and mythologies; earlier in The Dæmons, it is shown a race resembling the typical image of the Devil had visited Earth and become the basis for both Gods and Demons
In Perelandra, by C. S. Lewis, the protagonist must fight against a man possessed by a demon, hinted to be the devil himself
Eschatology and the ultimate fate of the universe
In S. M. Stirling's Nantucket series, the entire island of Nantucket is suddenly transported into the past, to about 1300 B.C, and the modern Americans marooned in the past must make the best of the Bronze Age world in which they find themselves; the Christians among them face the dilemma of whether or not to embark on missionary activity and spread their religion - even though Jesus Christ had not yet been born, and the very act of their spreading Christianity might so fundamentally change the world that Jesus might never be born at all
In The Sparrow, by Mary Doria Russell, most of the Jesuit missionaries sent to investigate a radio transmission from an unknown planet (believing that they have been chosen by God to be the first to set foot on an alien world) are killed by the planet's inhabitants; and the sole survivor is enslaved but eventually escapes and returns to Earth with his faith in tatters
In the TV series Stargate SG-1, and the 1994 Stargate film, the supposed ancient gods are revealed to be powerful, parasitic aliens posing as supernatural beings to exploit mankind
In the Star Trek: The Next Generation episode, "Who Watches the Watchers", a serious accident with a hidden scientific observation post starts a chain of events that leads to a primitive civilization becoming convinced that the Starfleet personnel are divine beings with Capt. Jean-Luc Picard being the supreme one; and the crew of the Enterprise struggle to prevent the reestablishment of religion in the civilization
In Philip K. Dick's novel, "VALIS", the protagonist faces an all-powerful God who subtly manipulates the actions and thoughts of humans in an effort to redeem humanity
The protagonist of "The Worthing Saga", by Orson Scott Card, keeps himself in hidden stasis over the years, and becomes the target of worship by the descendants of the very settlers that he delivered to a new world
"The Reformers"( Weird Science #20)—When three space men dressed in scifi versions of religious garb land on a planet to "free it of evil;" they are greeted by a man named Peter who informs them they are not needed (for there is no crime, no immorality, nor any of the evils seen in other societies); so they create evil for which they blame literature, clothing, and alcohol (as they have done on previous worlds)—including Earth—and we learn that their leader is the Devil and the planet they are on is called Heaven.
"Give us Barabbas!" Were they all tourists? (from The Bible and its Story Taught by One Thousand Picture Lessons, 1910)
H.G. Wells' A Modern Utopia, takes place in an alternate timeline in which "Jesus Christ had been born into a liberal and progressive Roman Empire that spread from the Arctic Ocean to the Bight of Benin, and was to know no Decline and Fall"  - with profound implications for Jesus' religious teachings, and later on those of Muhammad
In Behold the Man, by Michael Moorcock, twentieth-century Karl Glogauer (a Jew obsessed with the figures of Jesus and Carl Jung), travels in time to the year 28 A.D. where he meets various New Testament figures (such as John the Baptist and the Virgin Mary), and discovers that Mary and Joseph's child, Jesus, is a mentally retarded hunchback, who could never become the Jesus as is portrayed in the Scriptures, and after having a mental breakdown, steps into the role of Jesus, eventually dying on the cross (having specifically asked Judas to betray him)
In The Didymus Contingency, by Jeremy Robinson, a scientist's time-travel to see Jesus' death and resurrection—only to witness several scenes not recorded in the New Testament (while realizing Jesus was a fraud)—faces the dilemma of whether or not to make a revelation in the present which would shake the foundations of Christianity is complicated further with the appearance of an assassin from a different future...
The Last Starship from Earth, by John Boyd, is set in a dystopian society in the very near future (in an alternate timeline) where Jesus Christ became a revolutionary agitator and was never subjected to crucifixion; and who overthrew the Roman Empire by force of arms, and established a theocracy that has lasted until the twentieth century
In Garry Kilworth's story "Let's Go to Golgotha!", tourists from the future can book a time-traveling "Crucifixion Tour", but before setting out, they are strictly told that, when the crowd is asked whether Jesus or Barabbas should be spared, they must all join the call: "Give us Barabbas!"—however, when the moment comes, the protagonist suddenly realizes that the crowd condemning Jesus to the cross is composed entirely of tourists from the future, and that no actual Jewish Israelites of 33 A.D. are present at all
When the protagonists of Clifford Simak's Mastodonia make trips to the past commercially available, American church groups band together and seek to purchase an exclusive franchise for Jesus' time on Earth—not because they want to go there but because they do not want anyone at all to go there (the clergymen state quite forthrightly their apprehension that time travel would disprove some of the accounts given in the Gospels and thus undermine Christianity)—when refused, the church groups turn aggressive and energetically lobby Congress to ban time travel altogether; opening an enormous theological debate unresolved by the end of the book
In The Rescuer, by Arthur Porges, future scientists destroy a three-billion dollar time-travel project because a religious fanatic had taken over the machine, heading for Golgotha with a rifle and five thousand rounds in an attempt to save Jesus and the affair must be kept from the public, since some might identify with "The Rescuer"
"Resurrection Day", by Thomas Wycoff, is about a man sent back into time to steal Jesus' body to disprove Christianity
In There Will Be Time, by Poul Anderson, a young twentieth-century American (who has discovered that he has the ability to travel through time without any need of a machine) reasons that there must be others like him and that Jerusalem at the time of the crucifixion is a good place to try locating them, goes there and walks through the street singing the Greek mass (which is meaningless to people of the time), but get himself located by agents of a time-travel policing organization, who take him to their headquarters in the far future—without getting to see Jesus at all
In the TimeWars series by Simon Hawke, set in 2461, Cardinal Lodovico Consorti proposes to use the recently discovered time-travel technology to obtain empirical proof that Christ indeed rose from the dead after being crucified, causing the Catholic Church to excommunicate him (the Church hierarchy preferring to continue relying on faith alone and not seeking factual confirmation)
Times Without Number, by John Brunner, depicts an alternate reality in which the Spanish Armada had conquered England; and when time travel is discovered—controlled by the Catholic Church—it is decreed that every new pope would be privileged to travel to Palestine in the time of Christ's ministry, while everyone else is strictly forbidden to go there
In The Traveller, by Richard Matheson, a confirmed skeptic is chosen to be the first to travel in time to see the crucifixion (in a kind of traveling cage which makes him invisible to the people of the past) and he witnesses the actual event, causing him to feel empathy for Jesus; and is hauled back to the present after attempting to save him; and, although he had seen no miracles, he is a changed man, having seen "a man giving up his life for the things he believed" and stating, "that should be miracle enough for everybody"
The plot of Jesus Video, a German novel by Andreas Eschbach, revolves around the search for a hidden video camera that is believed to hold digital footage of Jesus recorded by a time traveler
In Frank Herbert's Dune, Paul Muad'dib becomes a prophetic messiah to the Fremen when his mental training and the drug/spice melange allow him to directly perceive time and space
In Stranger in a Strange Land, by Robert A. Heinlein, Valentine Michael Smith becomes a messiah figure to some of the general population of the earth, when having been raised by Martians, he turns their philosophy into a human religion
"He Walked Among Us", Weird Science #13—A spaceman on a four-year expedition uses his technology to help the locals—curing a boy with antibiotics, using dehydrated pills to turn water into milk, creating food—and defying the local priests, after his ship is destroyed by an asteroid; 2,000 years later another ship finds out the spaceman was executed on a rack—becoming the planet's religious symbol—and the spaceman the "son" of their god
A Case of Conscience, by James Blish, is the story of a Jesuit who investigates an alien race which evolves through several forms through the course of its life cycle and which has no religion, any concept of God, an afterlife, or the idea of sin
In "In partibus infidelium" ("In the Land of the Unbelievers") by Polish writer Jacek Dukaj, humanity makes contact with other space-faring civilizations, and Christianity—specifically, the Catholic Church—spreads far and wide until eventually humans become a minority among believers and an alien is elected as Pope
In Project Pope, by Clifford Simak, robots on the planet End of Nowhere have labored a thousand years to build a computerized, infallible pope to eke out the ultimate truth, jave their work preempted when a human Listener discovers what might be the planet Heaven
In "The Star", by Arthur C. Clarke, a Jesuit serving as the astrophysicist of an interstellar exploration ship suffers a deep crisis of faith upon discovering that the star seen on Earth at 4 BC was actually a supernova which destroyed an entire sentient and highly developed race—in Christian religious perspective, God had utterly destroyed these peaceful and virtuous beings in order to announce to humanity the birth of his son