Charles Troy Coleman (March 15, 1947 – September 10, 1990) was a convicted murderer executed in 1990 by lethal injection by the State of Oklahoma for the murder of John Seward.
 He was convicted in 1979 of the murder of Seward, who, along with his wife, was killed by a shotgun blast in rural Muskogee County, Oklahoma, when they interrupted a robbery at a relative's house.
 Coleman was executed in 1990 after almost twelve years on death row at the Oklahoma State Penitentiary.
 He was put to death by the State of Oklahoma by lethal injection at the age of 43 after exhausting all appeals.
 (At the time, Coleman had become friends with Gregory R. Wilhoit, now a death row exoneree, though they had argued bitterly over the death penalty.)
 He became the first person to be executed in Oklahoma since the 1966 electrocution of James Donald French after the United States Supreme Court reinstated the death penalty in 1976 and the first person in Oklahoma to be executed by lethal injection.
The Atheist's Guide to Christmas is a 2009 book written by 42 atheist celebrities, comedians, scientists and writers who give their funny and serious tips for enjoying the Christmas season.
 It made the Amazon best-seller list on its launch.
Daniel Edwin Barker (born June 25, 1949) is an American atheist activist who served as a Christian preacher and musician for 19 years but left Christianity in 1984.
 He and his wife Annie Laurie Gaylor are the current co-presidents of the Freedom From Religion Foundation.
 He has written numerous articles for "Freethought Today", an American freethought newspaper.
 He is the author of several books including "Losing Faith in Faith: From Preacher to Atheist".
Bhagat Singh (] 1907  – 23 March 1931) was a charismatic Indian socialist revolutionary whose two acts of dramatic violence against the British in India and execution at age 23 made him a folk hero of the Indian independence movement.
Tomás Garrido Canabal (September 20, 1891 in Playas de Catazajá, Chiapas – April 8, 1943 in Los Angeles, California) was a Mexican politician and revolutionary and atheist activist.
 Garrido Canabal served as dictator and governor of the state of Tabasco from 1920 to 1924 and again from 1931 to 1934, and was particularly noted for his Anti-Catholicism.
 During his term he fiercely persecuted the Church in his state, killing many priests and laymen and driving the remainder underground.
Why I am an Atheist is an essay written by Indian revolutionary Bhagat Singh in 1930 in Lahore Central Jail.
 The essay was a reply to a religious man who thought Bhagat Singh became an atheist because of his vanity.
Mirzā Jahāngir Khān (≈1870, or 1875, Shiraz — June 23, 1908, Tehran) (Persian: میرزا جهانگیرخان‎ ‎ ), also known as Mirzā Jahāngir Khān Shirāzi (شيرازى ) and Jahāngir-Khān-e Sūr-e-Esrāfil (جهانگیرخان صوراسرافیل), was an Iranian writer and intellectual, and a revolutionary during the Iranian Constitutional Revolution (1905–1911).
 He is best known for his bold editorship of the progressive weekly newspaper "Sur-e Esrāfil", of which he was also the founder.
 He was executed, at the age of 38, or 32, for his revolutionary zeal, following the successful coup d'état of Mohammad-Ali Shah Qajar in June 1908.
 His execution took place in "Bāgh-e Shāh" (باغشاه - The Garden of Shah) in Tehran, and was attended by Mohammad-Ali Shah himself.
 He shared this fate simultaneously with his fellow revolutionary Mirzā Nasro'llah Beheshti, better known as Malek al-Motakallemin.
 It has been reported that immediately before his execution he had said "Long live the constitutional government" ("Zendeh bād Mashrouteh") and pointed to the ground and uttered the words "O Land, we are [being] killed for the sake of your preservation [/protection]" ("Ey Khāk, mā barāye hefz-e to koshteh shodim").
The Atheist is written by Irish born playwright, Ronan Noone.
 His previous plays include "The Lepers of Baile Baiste" (Critics Pick, Boston Globe) and "The Blowin of Baile Gall" which had its Off-Broadway debut, produced by Gabriel Byrne, at the Irish arts Center in New York in 2005.
 "The Blowin of Baile Gall" was nominated by the American Theatre Critics Association for the Steinberg New Play Award and won the Elliot Norton Award for Outstanding New Script.
 In 2003, Noone was chosen by Boston Magazine as the Best Young Playwright of the Year.
 The subject of "The Atheist" is not God, but the religion of tabloid journalism.
Nikolai Vasilyevich Rumyantsev (Russian: Николай Васильевич Румянцев , 1892–1956) was a Soviet author of several polemics on the history of Christianity.
 He was also a member of the Soviet circle "Atheist" and the Union of Militant Atheists.
 In the 1920s Rumyantsev was one of the leading proponents of the so-called mythological school in the Soviet academia.
 He authored such publications, as "The Pre-Christian Christ" (1926), "The Pagan Christs – the Ancient Precursors of Christianity" (1929), "The Apocalypse – The Revelation of John" (1934) and "Orthodox Holidays, Their Origin and Class Essence" (1936).
 "The Apocalypse – The Revelation of John" was published under the influence of Abram Ranovich.
 In that publication Rumyantsev, while not explicitly retracting his earlier opinions, offered a study of early Christianity which stressed not its derivation from supposed ancient mythology, but its intrinsic relation to revolutionary, messianic elements in contemporary Judaism.
There are no known official statistics of religions in North Korea.
 North Korea is an atheist state where public religion is discouraged.
 Based on estimates from the late 1990s and the 2000s, North Korea is mostly atheist and agnostic, with the religious life dominated by the traditions of Korean shamanism and Chondoism.
 There are small communities of Buddhists and Christians.
 Chondoism which is represented in politics by the Party of the Young Friends of the Heavenly Way, and is regarded by the government as Korea's "national religion" because of its identity as a "minjung" (popular) and "revolutionary anti-imperialist" movement.

Question: Why I Am an Atheist was written by the revolutionary who was executed at what age?
Answer: 23