I believe that music is a great outlet for people. and as we all know life is not always full of ups. There are plenty of downs in life. What they are saying is this song is that in one of those downs when they are falling away from God and losing faith, they need someone to help then and save then,They are only human and not "superhuman" meaning that they struggle sometimes and can only do what a human can do. Just my thoughts, It isnt supposed to be worship or anything, more of an outlet.