To put it plainly, there are people who attempt to "collect" salvation, proclaiming Christ, and then presume to return wholly to the world unaffected by that process.

To those people, who do not turn a leaf and continue to grow in Christ, rejecting the process of sanctification, I suspect that Matthew 7:21-23 warns about it -

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.

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?

23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.