The new movie Stations of the Cross explores whether living in a big city can make a person feel very lonely, and therefore vulnerable to extremist groups.
The film looks at how fundamentalist groups sometimes recruit vulnerable disconnected individuals in large cities. It suggests that individuals often come to cities like London to find something to believe in, or find a different way of life.
There have been several recent reports about Londoners going to fight for and against ISIS.
The film is in UK cinemas from today, and tells the story of a young girls who becomes involved with an extreme Catholic fundamentalist sect.
To discuss the the subject of religious fundamentalism are Dr Marat Shterin, senior lecturer at the Department of Theology & Religious Studies at Kings College, Sister Myra Poole a former nun and founder of the Catholic Women’s Ordination and ex-fundamentalist Jonny Scaramanga who's now a PhD student at the Institute of Education.