The Traitors winner Harry Clark is among seven celebrities taking part in this year's Pilgrimage on BBC Two.
The annual show sees a group of famous faces - of different faiths and beliefs - embark upon an epic trek along an ancient route, which this year will be a 300km journey through the Austrian and Swiss Alps.
Also on the show this year are The Wanted star Jay McGuiness (agnostic), comedian Helen Lederer (Catholic), presenter Jeff Brazier (meditation), standup comedian Daliso Chaponda (Baha'i), Paralympics star Stef Reid (Christian) and journalist Nelufar Hedayat (Muslim).
"I've always had faith," said Clark. "I was baptised and all my family are Catholic. I was an altar server in church and played the violin in church with my sister, so I was always around faith.
"I'm so excited to go on this Pilgrimage, to meet the other pilgrims and find out about their religions, what they believe in and why, and if they don't believe, why? Because I've questioned who God is my whole life, not in a bad way, but as in no-one knows who God is."
Brazier said: "The best way to describe my faith is spiritual. I would say the universe is what guides me, the universe just chucks whatever I need at me, whenever I need it. To answer the question – what is God? - is a really tough one, but for me right now, I would say God is love; so God can be within all of us.
"I also love learning from people and on our Pilgrimage, there is every chance that there might be some sort of transformation in terms of my beliefs, my views. So, I see it as a wonderful opportunity to just explore some themes and some conversations that I probably don't have very often."
Meanwhile, McGuiness said: "I agreed to go on this Pilgrimage because it just sounded the perfect thing to do. I was born and raised in Nottinghamshire to an Irish Catholic family and we'd go to our Catholic school and sing church songs and on Sunday, we'd all go and sit next to each other on the pew. But as time's gone on, I think that the rule book that comes with being a Catholic, is too judgmental for where I am.
"I think the closest I can get to what I am, would be considered agnostic. I don't believe there is a God, and I don't believe there isn't. I think it's impossible for us to know, and maybe that's what being a human is; we are stuck here in this mortal realm, and you only find out once you go beyond the curtain. But I would love to know a little bit more about what I am. So, I'm looking forward to that. Who knows what I'll find on this Pilgrimage."
Pilgrimage: The Road Through the Alps airs on BBC Two next month.
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