Asked about the religious imagery on the record, the band's frontman told The Big Issue that the record is "not a statement of faith" and "is more social than religious, verging on the philosophical".
"We don't feel evangelical about anything," Mumford said. "Really. Other than music.
"The lyric you said, 'I set out to serve the Lord', no-one realises it's pluperfect tense. The lyric is 'I had set out to serve the Lord'. It's looking back at a time when that happened."
He added: "I don't even call myself a Christian. Spirituality is the word we engage with more. We're fans of faith, not religion.
"We're just writing songs that ask questions. Sometimes the best way to go about exploring a question, things we wouldn't necessarily talk about in conversation, is by writing a song."
Read the full interview with Mumford & Sons in The Big Issue, out now.
The Big Issue is sold by homeless and vulnerably housed vendors for £2.50, with £1.25 of the cover price going directly to the vendor.
Watch the video for Mumford & Sons' 'I Will Wait' below: