The same way Peter did.
Matthew 16:13-17
If you read carefully these passages are not about how individuals can know God, but establishing the providence of the Catholic Church, all the Popes who follow Peter, and Rome as the center of the Orthodoxy. The lead in actually speaks to the confusion to whom Jesus may, or may not have been, in the minds of the people at that time.
Not exactly a ringing enforcement of how a Protestant can "know Jesus".