You might have a knowledge of who Jesus was, you may even have a positive opinion on what He did, but that only means you are close to the kingdom of God, but close to the kingdom is not in the kingdom. Recognizing and submitting to the sovereignty of Jesus, making him Lord of your life is the only way to be a part of the Kingdom. Jesus is the Son of God, saviour to all those who trust in him, and needs to be Lord of your life.