That would be satan, but we also must take the responsibility for ourselves. Sometimes it's just easier to go along with the emotionalism than it is to think, ponder and truly meditate on the deeper things of God.
I don't have a real problem with the contemporary worship style as long as the message is not watered down. That is what I have a problem with.
Who will lead us back?
The Holy Spirit will lead us and if get on our knees and earnestly seek God to lead, guide and direct us to where He would have us serve and worship Him we will find where we need to be.
Right now I just happen to be listening to Dennis Jernigan's Giant Killer: A Heart Like David, he's a praise and worship musician but his theology is sound. God just happened to use his music to speak to my heart and minister to me where I am at right now. I know that God is faithful and trust Him to show me the way.