Devils believe that Jesus died for the sins of mankind and believe His blood paid the price, but don't love Jesus for it. People confess these truths about the Gospel and know the facts about the bible that doesn't mean that they Love Jesus. Love isn't a knowleage about Jesus, It is Knowing Jesus.
Mat 7:20 Wherefore by their fruits ye shall know them.
Mat 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Mat 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Mat 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.