In the dialogue below, Jesus scoffs at Peter’s claim that he will give his life for Jesus. He tells Peter that before the sun comes up in the morning--before the rooster crows--Peter would that very night pretend he did not even know Jesus.
Readers should note especially that in the John passage below, Jesus is predicting that the rooster would not crow until after Peter has denied knowing Jesus three times.
Simon Peter said unto him, Lord, whither goest thou? Jesus answered him, Whither I go, thou canst not follow me now; but thou shalt follow me afterwards.
Peter said unto him, Lord, why cannot I follow thee now? I will lay down my life for thy sake.
Jesus answered him, Wilt thou lay down thy life for my sake? Verily, verily, I say unto thee, The cock shall not crow, till thou hast denied me thrice. (John 13:36-38)
Thus, the writer of John 13 above says Jesus predicted there would be no crowing by the rooster until after Peter has denied knowing Jesus three times. As you will see below, however, the writer of Mark presents information which totally contradicts what John said Jesus predicted would happen.
And as Peter was beneath in the palace, there cometh one of the maids of the high priest:
And when she saw Peter warming himself, she looked upon him, and said, And thou also wast with Jesus of Nazareth.
But he denied [the first denial], saying, I know not, neither understand I what thou sayest. And he went out into the porch; and the cock crew.
Wait a minute! John said Jesus predicted the cock wouldn’t crow until after Peter had denied Jesus three times; this is only the first time! So there can be no doubt that the denial above is the first one, and not the third, we show below the other two denials:
And a maid saw him again, and began to say to them that stood by, This is one of them.
And he denied it again [the second denial]. And a little after, they that stood by said again to Peter, Surely thou art one of them: for thou art a Galilaean, and thy speech agreeth thereto.
But he began to curse and to swear, saying, I know not this man of whom ye speak [This is the third denial.] (Mark 14:66-72 KJV)
We see clearly that either John was wrong about what Jesus predicted, or Mark was wrong about when the cock crowed, or else they were both right--but that means that the son of God was a false prophet.
Joseph F. Alward
"Skeptical Views of Christianity and the Bible"