I'm not sure why this folky-band is so popular right now. It could be the singer's amazing voice, the sometimes soothing sometimes exciting tempo, or the stories and lyrics within their songs. Anyway, I really like this group.
Their song "Little Lion Man" always reminds me of Joshua 1:9. "Be strong and courageous, do not be terrified, do not be discouraged for the LORD, your God, is with you wherever you are." The lion reminds me of this courage and strength, the boldness we are to have in God. This song describes the feeling of the "discourage," what happens when we try to do it all without God. It acknowledges the strength and courage, but alone we can only "F*** it up this time."
"Little Lion Man" Lyrics: http://www.elyrics.net/read/m/mumford-&-sons-lyrics/little-lion-man-lyrics.html
Another one of their great songs is "The Cave" it bears help and hope. Not only will the singer not give up on himself, but he won't give up on you either. He will gain the courage and strength he needs, his trials make him stronger, grander than he was before. He won't give in to temptation, he will live as he is meant to be. There are a lot of Christian elements that you could take away from either one of these songs.
"The Cave" Lyrics: http://www.metrolyrics.com/the-cave-lyrics-mumford-sons.html
Even though they are becoming even more popular now, I've listened to them most of the school year and they are always refreshing. When I'm looking for a good song to listen to, these two songs never let me down.