I encourage to read Mt 7:13-29. Verse 22-23 says, “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.” The Bible repeatedly reminds the church to beware of false Christs; false prophets; false teachers; false doctrine; etc (Mk 13:22-23, 2Pt 2:1-2).