linguistic:translation, structural:expansion
Religion

Themes of religion and spirituality appear in much of Clarke's writing. He said: "Any path to knowledge is a path to God – or Reality, whichever word one prefers to use." He described himself as "fascinated by the concept of God". J. B. S. Haldane, near the end of his life, suggested in a personal letter to Clarke that Clarke should receive a prize in theology for being one of the few people to write anything new on the subject, and went on to say that if Clarke's writings had not contained multiple contradictory theological views, he might have been a menace. When he entered the Royal Air Force, Clarke insisted that his dog tags be marked " pantheist " rather than the default, Church of England, and in a 1991 essay entitled "Credo", described himself as a logical positivist from the age of 10. In 2000, Clarke told the Sri Lankan newspaper, The Island, "I don't believe in God or an afterlife", and he identified himself as an atheist. He was honoured as a Humanist Laureate in the International Academy of Humanism. He has also described himself as a "crypto-Buddhist", insisting Buddhism is not a religion. He displayed little interest about religion early in his life, for example, only discovering a few months after marrying that his wife had strong Presbyterian beliefs.

Later in his life, Clarke began to hold a more hostile view of religion. A famous quotation of Clarke's is often cited: "One of the great tragedies of mankind is that morality has been hijacked by religion." He was quoted in Popular Science in 2004 as saying of religion: "Most malevolent and persistent of all mind viruses. We should get rid of it as quick as we can." In a three-day "dialogue on man and his world" with Alan Watts, Clarke said he was biased against religion and could not forgive religions for what he perceived as their inability to prevent atrocities and wars over time. In his introduction to the penultimate episode of Mysterious World, entitled "Strange Skies", Clarke said, "I sometimes think that the universe is a machine designed for the perpetual astonishment of astronomers", reflecting the dialogue of the episode, in which he stated this concept more broadly, referring to "mankind". Near the very end of that same episode, the last segment of which covered the Star of Bethlehem, he said his favourite theory was that it might be a pulsar. Given that pulsars were discovered in the interval between his writing the short story, " The Star " (1955), and making Mysterious World (1980), and given the more recent discovery of pulsar PSR B1913+16, he said: "How romantic, if even now, we can hear the dying voice of a star, which heralded the Christian era."

Despite his atheism, themes of deism are a common feature within Clarke's work. Clarke left written instructions for a funeral: "Absolutely no religious rites of any kind, relating to any religious faith, should be associated with my funeral."