Sekumpulan pandangan terhadap berbagai agama di dunia dieksplorsebagaidieksplor sebagai perjalanan Bill Maher pada sejumlah tempat-tempat keagamaan termasuk [[Yerusalem]], [[Kota Vatikan|Vatikan]], dan [[Kota Salt Lake]], mewawancarai pemercaya-pemercaya dari berbagai latar belakang dan kelompok. Mereka meliputi mantan anggota [[Jews for Jesus]], [[Kristen]], [[Islam|Muslim]], mantan [[Mormon]],<ref>{{cite web|url=http://www.sltrib.com/ci_10618909?IADID=Search-www.sltrib.com-www.sltrib.com|title= Review: Maher takes on religion but sounds like he's preaching to the agnostic choir|last=Means|first=Sean|date=2008-10-02| accessdate=2008-10-18}}</ref> dan [[Yudaisme Hasidik|Yahudi Hasidik]].<ref>{{cite news|first=Stephen|last=Schaefer|url= http://news.bostonherald.com/entertainment/movies/general/view/2008_09_29_Bill_Maher_takes_politically_incorrect_look_at_faith_in_%E2%80%98Religulous%E2%80%99/|title=Bill Maher takes politically incorrect look at faith in ‘Religulous’|publisher=[[Boston Herald]]|work=the edge|date=2008-09-29|accessdate=2008-05-14}}</ref><ref>{{cite news|first=Thom|last=Powers|url= http://www.tiff07.ca/filmsandschedules/filmdetails.aspx?ID=707111610451386|title=Religulous: A Conversation with Bill Maher and Larry Charles|publisher=Toronto International Film Festival Group|accessdate=2007-09-10}}</ref><ref>{{cite news|last=Hemingway|first=Mollie Ziegler|title=Look Who's Irrational Now|work=[[The Wall Street Journal]]|publisher=[[Les Hinton]]|date=2008-09-18|url= http://online.wsj.com/article/SB122178219865054585.html|accessdate=2008-10-01}}</ref> Maher melakukan perjalanan ke [[Speakers' Corner]] di [[Hyde Park, London]], di mana ia "mempraktikan" kepercayaan-kepercayaan [[Scientology]].<ref name="moore">{{cite news|last=Moore|first=Roger|title=Movie review: 'Religulous' -- 4 out of 5 stars|work=[[The Orlando Sentinel]]|date=2009-10-01|url=http://www.orlandosentinel.com/business/orl-movie-review-religulous-010108,0,4421023.story|accessdate=2008-10-01}} {{rating|4|5}}</ref><ref>{{cite news|last=Slotek|first= Jim|title=Anti-religion film not risky enough|work=CANOE - JAM! Movies|publisher=Canoe|date=2008-10-03|url=http://jam.canoe.ca/Movies/Reviews/R/Religulous/2008/10/03/6964346-sun.html|accessdate=2008-10-03}}</ref>
Maher juga melakukan perjalanan di [[Museum Penciptaan]] dan [[Holy Land Experience]].
