As well as this special presented by Aled Jones (4.55pm BBC One), you'll find advent programmes on radio, including Radio 3's traditional service with carols.
In episode four, Professor Diarmaid MacCulloch looks at the Reformation and its repercussions.
Megan, brought up as a Jehovah's Witness, resolves to engage with the non-religious world around her. Find out how she gets on, and discover more about the beliefs of Jehovah's Witnesses.
This Muslim festival remembers Ibrahim's willingness to sacrifice his son when ordered to by God. In the end he was asked to sacrifice a sheep, which is usually reflected in the festival.
Use our scroll-down list to explore a range of the world's beliefs, or use the index page here.
Brand new podcasts, highlights from Religion & Ethics and audio and video from BBC News.
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Browse through the colourful image galleries: faith, people, worship and issues in pictures.