Zoe Basia Brown, 24, will take part in the programme which sends 12 single people to the Mediterranean island of Mallorca in an attempt for the to 'find love'.
The model said she would avoid controversy in a bid not to embarrass her priest or mum.
She said: "I'm a Christian and that is the number one thing in my life, so I can turn the other cheek.
"I started going to church two years ago. It's the opposite to fashion and I love it because everyone is so nice.
"I'm not going to start giving sermons on the island, but it's a big part of me."
She added: "I'm not going to mess around on Love Island, I'm going to maintain my dignity.
"A cheeky snog might happen, but nothing more. I don't want to disgrace myself in front of my priest and mum."
The ITV2 show involves the group living in a luxury villa on the island in a bid to win a £50,000 prize.
It launches on Sunday June 7 at 9pm.