The Christian singer has been talking about his relationship with God, his life after being falsely accused of child sex abuse and his music.
He was accused of abusing children between 1958 and 1983, but the Crown Prosecution Service said earlier this year he would face no further action.
Sir Cliff had always said the allegations against him were completely false.
Before proceedings against him were dropped, the BBC broadcast a raid on his former Berkshire home on national television in conjunction with South Yorkshire Police.
The corporation has not apologised for televising the raid and Sir Cliff is now suing them over the incident.
He has also said he's forgiven his accusers and that his relationship with the BBC is "fine".
Speaking on Premier Christian Radio's Inspirational Breakfast, Sir Cliff said of his faith: "I think it's stronger than it's ever been. For me it was a learning process too, that God really does remain loyal without uttering a word.
"I kept thinking to myself: 'I wonder how people who say they're atheists, how can they cope with something like this?'
"What supported me best was when everybody said 'goodnight' and then I was on my own, and when you're on your own you know you're not. When you're a Christian you know that you could speak to God whatever you want to, and I did.
"To have someone make a false accusation about you and have it publicly displayed, it's impossible to explain what that feels like unless you've been through it. So it was a very difficult time and it left me in despair, and it has damaged me."
Sir Cliff is currently promoting his new album, Just... Fabulous Rock 'n' Roll, which entered the UK charts last week at number four.
Listen to Premier's John Pantry and Rosie Wright speaking to Sir Cliff Richard on Inspirational Breakfast:
