hHopefully these verses will offer clarity for you regarding this.
Matthew 16:16
And Simon Peter answered and said, Thou art the Christ, the Son of the living God.
Acts 16:31
And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
Of course by the mouth of two witnesses shall a matter be established. Yet didn't Jesus call him Satan just a few verses down from Matthew 16:16.
Then charged he his disciples that they should tell no man that he was Jesus the Christ. Matt 16:20
But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me:Matt 16:23
Then if any man shall say unto you, Lo, here is Christ, or there; believe it not. Matt 24:23
Speaking of two witnesses.
28 And when he was come to the other side into the country of the Gergesenes, there met him two possessed with devils, coming out of the tombs, exceeding fierce, so that no man might pass by that way.
29 And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? art thou come hither to torment us before the time?
Matt 8:28-29