I believe he is the messiah, the Deliverer, sent by G-d to serve as the last and perfect sacrifice for the atonement of sins.
If you believe that Jesus is all of these things, then why would you not want to follow Him and obey Him? If He is the Messiah, then you know that He is the only way to be reconciled to God. If you follow Him and obey Him, then you are a Christian, even though you may call yourself a Messianic Jew, or something similar, it becomes a matter of semantics. You must agree that to believe that He is the Messiah, and to not follow and obey Him, would be foolishness.
Now as to Paul. If you read of his conversion in Acts 9, you will notice that it is a very public event. All of those with Paul also saw the light, and heard the voice, though they did not comprehend it. The light was described as brighter than the noon day sun. For those who have experienced the noon day sun in that part of the world, that is remarkable. In 1 Timothy 6:15-16, God is described as living in "unapproachable light". This would indicate that the messenger would be either God Himself, or someone (Jesus) who had been glorified with God. The change in Paul is immediate. He is blinded, led into Damascus, where he spends the next three days praying, neither eating nor drinking.
Ananias has a vision to go and heal Paul's blindness and preach the gospel to him. He is relunctant, knowing Paul's past persecuting spirit, but is commanded of God. He goes to Paul, places his hands on him, and using the miraculous healing powers granted him by the Holy Spirit, he heals Paul's blindness. He then teaches him the gospel, and Paul believes in Jesus, and is baptized into the church. All of this is done before many witnesses who could verify or deny Luke's account. The fact that Paul immediately goes out and begins to preach Jesus as the Son of God, and as Lord and King, when only days before he had a murderous and violent spirit against His followers is miraculous in itself. Again, all of this in front of many witnesses who were amazed at his transformation.
Later, when Paul goes to Jerusalem, and the apostles are reluctant to accept him, Barnabus is able to recommend him and the apostles immediately accept him. Barnabus's opinions were obviously highly regarded.
You must ask yourself, how could all of these things be done in front of many witnesses, yet Luke's account not be opposed? Why would you believe Luke to be reliable up to this point, and then no longer be truthful? If Jesus did appear to Paul and appoint him as an apostle, then we must believe his sayings as inspired by the Holy Spirit who was sent by Jesus.
You must decide. There is no middle road. Either you have saving faith in Jesus Christ, or you don't.