Jesus the Messiah now begins His ministry. His purpose? To offer His Kingdom to the nation of Israel (Mark 1:38). His message? That He is the Messiah and the nation of Israel must repent and believe in Him.
Don’t be confused. John’s baptism was for the nation of Israel (not the Church), his message was to prepare the way for the Messiah and His Kingdom.
Read Matthew 3:1-17, Mark 1:1-45, and Luke 3:1-38