Question: Unlike the episode "Today I Am a Clown", which has a religious theme, "The Simpsons"' episode "Alone Again, Natura-Diddily" demonstrates what theme?
Context: "Yu-Gi-Oh!  Arc-V" is the fourth spin-off anime in the Yu-Gi-Oh!  franchise.  It is produced by Nihon Ad Systems and broadcast by TV Tokyo.  It is directed by Katsumi Ono and produced by Studio Gallop.  Its plot focuses on Yuya Sakaki, who is a boy seeking to become the greatest entertainer in Action Duels who brings forth a new summoning method to Duel Monsters known as Pendulum Summoning.  Currently, twelve pieces of theme music are used for the series: six openings and six ending themes.  From episodes 1–30, the first opening theme is "Believe × Believe" by Bullet Train, while the first ending theme is "One Step" by P-Cute.  From episodes 31–49, the second opening theme is "Burn!"  by Bullet Train, while the second ending theme is "Future Fighter!"  by Kenshō Ono and Yoshimasa Hosoya.  From episodes 50-75, the third opening theme is "Hanate" (ハナテ , lit.  "Unleash") by Gekidan Niagara, while the third ending theme is "Arc of Smile!"  by Boys And Men.  From episodes 76-98, the fourth opening theme is "Kirifuda" (切り札 , lit.  "Trump Card") by Cinema Staff, while the fourth ending theme is "Speaking" by Mrs. GREEN APPLE.  From episodes 99-124, the fifth opening theme is "Kibō no Hikari" (キボウノヒカリ , lit.  "Light of Hope") by Unknown Number, while the fifth ending theme is “Vision” (ビジョン , Bijon ) by Kusoiinkai.  From episodes 125-147, the sixth opening theme is "Pendulum Beat!"  by Super★Dragon, while the sixth ending theme is "Dashing Pendulum" by M!lk.  For Episode 148, no opening theme was used, while the second ending theme, "Burn," was used for the final episode.  For the English Dub version, the opening theme is "Can You Feel the Power". This list is an episode guide for the anime version of "Great Teacher Onizuka" by Tohru Fujisawa.  The first episode aired June 30, 1999 on Fuji Television.  The series ran for 43 episodes with the final episode airing on September 24, 2000.  During the original run, episodes were identified as "lessons" and did not have titles.  The episode titles in the list below are from the English Tokyopop release.  The anime series uses five pieces of theme music: two openings and three endings.  The first opening theme, "Driver's High" by L'Arc-en-Ciel is used from episodes 1 to 17.  The second opening theme, "Hitori no Yoru" by Porno Graffitti is used from episodes 18 to 43.  The first ending theme, "Last Piece" by Kirari is used from episodes 1 to 17.  The second ending theme, "Shizuku" by Miwako Okuda is used from episodes 18 to 33, while the third ending theme, "Cherished Memories" by HONG KONG KNIFE is used from episodes 34 to 42.  The first opening theme, "Driver's High" is used as the ending theme in episode 43 and an insert song in episode 17. Harikatha (Harikathe in Kannada), literally " Stories of Hari(Narayana)", also known as "Katha Kaalakshepa" ("Katha storytelling" - Spending time with kathe), is a form of Hindu religious discourse in which the storyteller explores a religious theme, usually the life of a saint or a story from an Indian epic. Tierra Santa is a religious theme park in Buenos Aires, Argentina.  It claims to be the world's first religious theme park. Cornelis Bernardus "Kees" Bastiaans (20 November 1909, Mill, Netherlands - 31 March 1986, Mill) was a Dutch Painter.  He was an Expressionist, often with a religious theme to his work.  One of his paintings "Familieportret" is exhibited in the Noordbrabants Museum in 's-Hertogenbosch. Religion is one of many recurring themes on the American animated television series "The Simpsons".  Much of the series' religious humor satirizes aspects of Christianity and religion in general.  However, some episodes, such as "Bart Sells His Soul" and "Alone Again, Natura-Diddily", can be interpreted as having a spiritual theme.  The show has been both praised and criticized by atheists, agnostics, liberals, conservatives and religious people in general for its portrayal of faith and religion in society.  The show can function as a mediator of biblical literacy among younger generations of irreligious viewers. "Alone Again, Natura-Diddily" is the fourteenth episode of the eleventh season of "The Simpsons", and marks the final regular appearance of the character Maude Flanders.  In the episode, she is killed in an accident while watching a speedway race, devastating Ned Flanders and prompting Homer to find a new woman for his grieving neighbor.  After a series of unsuccessful dates, Ned begins to question his faith in God.  However, his faith is restored after hearing the female lead singer of a Christian rock band, played by guest star Shawn Colvin, sing in church.  The name of the episode is in honor to the song "Alone Again (Naturally)" by Gilbert O'Sullivan. "I'm Goin' to Praiseland" is the nineteenth episode of the twelfth season of the American animated sitcom "The Simpsons".  It originally aired on the Fox network in the United States on May 6, 2001.  In the episode, Ned Flanders builds a Christian-themed amusement park to commemorate his dead wife, Maude Flanders.  The episode marked the return of the character Rachel Jordan (voiced by Shawn Colvin), who had previously appeared in the season eleven episode "Alone Again, Natura-Diddily".  Since airing, "I'm Goin' to Praiseland" has received mixed reviews from critics. "Today I Am a Clown" is the sixth episode of "The Simpsons"<nowiki>'</nowiki> fifteenth season.  It originally aired on the Fox network in the United States on December 7, 2003.  The episode focuses on Krusty's religion, Judaism. Japhet and Happy was a British newspaper cartoon strip originally appeared as 'The Adventures of the Noah Family' initially in the Daily News during 1919 and transferred in 1930 to the News Chronicle.  It was originated and drawn by J. F. Horrabin, James Francis Horrabin (1884–1962) who was a British journalist, cartoonist and cartographer, and he was elected Labour Member of Parliament for Peterborough from 1929-1931.  He wrote Political books as well as the 'Dot and Carrie' strip for the Star that ran from 1922 to 1964.  The Noah Family names are based on religious names, but the cartoon strips have no religious theme.
Answer: a spiritual theme