I believe in Jesus Christ as my Lord and savior. I believe that Jesus died for my sins and rose again and that's my belief. I still don't know what 'Christian' means. I'm a follower of Christ but I keep making a whole bunch of mistakes. And I thank God for forgiveness.
Music is emotional and you may catch a musician in a very unemotional mood or you may not be in the same frame of mind as the musician. So a critic will often say a musician is slipping.