Pseudo-Christians

Apparently, not everyone who professes to be a follower of Jesus Christ, even some who during their lifetime worked miracles in His name, will be accepted of Him at their judgment. Please consider St. Matthew 7:21-23:

"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.

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?

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

As such, it behooves believers in Christ to be certain that their works will be acceptable to Him. Thus by which means may we distinguish between the true and false institutions and believers professing to be engaged in the building of Christ's kingdom on earth?