Pauline McLynn is one of seven celebrities on the road to Istanbul in the new season of the BBC Two documentary series Pilgrimage.
Pilgrimage: The Road to Istanbul will screen on BBC Two this Spring and sees Father Ted star McLynn and another atheist, comedian Dom Joly, joining "journalist Adrian Chiles, a converted Catholic; former politician Edwina Currie, a lapsed Jew; Olympian Fatima Whitbread, a practicing Christian; broadcaster Mim Shaikh and television presenter Amar Latif, both Muslims".
They will "live as simple pilgrims following an ancient military route to the historic city of Istanbul, which has been transformed into a modern-day path of peace".
"Donning backpacks and walking boots, they'll stay in basic hostels, sleep in shared dorms, and follow a largely untrodden route," says the BBC.
McLynn and her travelling companions start their journey in the Serbian capital, Belgrade. They will travel through Bulgaria and the Balkan Mountains, before crossing into Turkey and onwards to Istanbul and the Süleymaniye Mosque. They have over 1,000km to cover in a little over two weeks.
Daisy Scalchi, BBC Commissioning Editor, Religion said the series "brings the conversations around spirituality and faith to a wide audience in an engaging and personal way".
"The range of beliefs and backgrounds of all seven pilgrims, with their similarities and differences, show that the questions at the heart of religion are relevant to all of us, regardless of faith," she added.