Since Jesus saves, He knows who’s saved and unsaved. We don’t need to be categorizing individuals as to who is and who isn’t. Our’s is to share the Law and Gospel and God the Holy Sprirt will do the creating of faith for salvation. The Spirit testifies to the individual as to their personal salvation.
2Ti 2:19 Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity.