[quote="Zosimus41, post:1, topic:289928"]
When Jesus had finished instructing his twelve disciples, he went on from there to teach and preach in their towns. 2 Now when John heard in prison about the deeds Christ had done, he sent his disciples to ask a question: 3 “Are you the one who is to come, or should we look for another?” 4 Jesus answered them, “Go tell John what you hear and see
No, John did not doubt. John saw the dove and heard the voice like everyone else. He sent his disciples because they were still hanging around when by then they should have all gone over to Jesus. Since John heard that Jesus had already started performing the other confirmatory signs that Jesus was The One - remember, there was a delay after Jesus' Baptism before he officially started his ministry - he took the opportunity to set his own disciples straight.
John was being polite and pretending he was the one with the question instead of telling his own disciples to quit following himself, because he wanted his own disciples to see for themselves instead of having to be told what to think about Jesus. Because at some point, even if you are someone's disciple, you can't spend the rest of your life waiting for your guru or whatever to tell you what to think. John's ministry was pretty much wrapped up by then, and he would be dead shortly anyway.
Jesus knew what John was up to the instant the disciples asked the question. Jesus' response basically was, "Seriously, guys? You need to be told? Why is it obvious to everyone but you?"
Hopefully, the disciples would go back and recite everything Jesus was doing, and once they realize what they are saying, stop themselves in mid-sentence, do a facepalm, then turn around and leave to go follow Jesus instead.
That's what Jesus meant when he talked about celebrating while the bridegroom is here, and about going out to see a reed blown by the wind.