12-year-old Regan MacNeil begins to adapt an explicit new personality as strange events befall the local area of Georgetown. Her mother becomes torn between science and superstition in a desperate bid to save her daughter, and ultimately turns to her last hope: Father Damien Karras, a troubled priest who is struggling with his own faith.
Two Jesuit priests travel to seventeenth century Japan which has, under the Tokugawa shogunate, banned Catholicism and almost all foreign contact.
Having lived through traumatizing events during WWII, Father Lankester Merrin takes a sabbatical from the Church to conduct archaeological excavations in British-administered East Africa. Merrin unearths an ancient Byzantine church believed have been built and then immediately buried to keep down evil from the crypt below. The natives are convinced that uncovering the church has unleashed a demon, and begin to violently clash with the British military troops. As the village rapidly disintegrates into chaos and war, Merrin must face-off with the demon which has taken possession of somebody close to him.
Haunted by terrible acts the Nazis forced him to participate in, the disenchanted Father Lankester Merrin focuses his energies on helping with an archaeological dig in the northern part of Kenya. There, the crew uncovers a church that predates Christian missions into the area, but the discovery also causes strange events to start occurring -- including physical changes to a young, disabled boy, whom Merrin grows to suspect has been possessed by a demon.
Set in Middle America, a group of teens receive an online invitation for sex, though they soon encounter Christian fundamentalists with a much more sinister agenda.
Good natured Reverend Henry Biggs finds that his marriage to choir mistress Julia is flagging, due to his constant absence caring for the deprived neighborhood they live in. On top of all this, his church is coming under threat from property developer Joe Hamilton. In desperation, Rev. Biggs prays to God for help - and help arrives in the form of an angel named Dudley.
Father Greg Pilkington is torn between his call as a conservative Catholic priest and his secret life as a homosexual with a gay lover, frowned upon by the Church. Upon hearing the confession of a young girl of her incestuous father, Greg enters an intensely emotional spiritual struggle deciding between choosing morals over religion and one life over another.
In this two-part Channel 4 series, Professor Richard Dawkins challenges what he describes as 'a process of non-thinking called faith'. He describes his astonishment that, at the start of the 21st century, religious faith is gaining ground in the face of rational, scientific truth. Science, based on scepticism, investigation and evidence, must continuously test its own concepts and claims. Faith, by definition, defies evidence: it is untested and unshakeable, and is therefore in direct contradiction with science. In addition, though religions preach morality, peace and hope, in fact, says Dawkins, they bring intolerance, violence and destruction. The growth of extreme fundamentalism in so many religions across the world not only endangers humanity but, he argues, is in conflict with the trend over thousands of years of history for humanity to progress to become more enlightened and more tolerant.