Street evangelist Marios Kaikitis tells Giles Fraser why he stands on Leicester Square with a sketch board trying to engage passers by with his message of Jesus Christ.

And Giles explores how different religious groups, within Christianity and Islam, evangelise today. Perhaps crucially, does it work?

He's joined by Daryl A Watson, a mission leader at the Church of Jesus Christ of the Latter Day Saints, also known as the Mormon church, Dr Shuruq Naguib, a lecturer in Islamic Studies at the University of Lancaster University and Reverend Dr Hannah Steele, Director of St Mellitus theological college in London, who writes about evangelism and mission today.

They discuss the practical, moral and spiritual issues faced by those who want or feel compelled to share their religious beliefs with others. In an increasingly secular country, it it getting more difficult?

Producer: Rebecca Maxted