"Verily, verily, I say unto you, except a man you must be born again of the WATER and the SPIRIT, he cannot enter into the kingdom of God." John 3:5
"Repent, and be BAPTIZED (water) every one of you in the name of JESUS CHRIST for the remission of sins, and you shall receive the gift of the HOLY GHOST." Acts 2:38.
"Not by works of righteousness which we have done, but according to his mercy He saved us, by the washing and regeneration (water) and the renewing of the Holy Ghost (spirit).
Jesus reaffirmed in John 3:7 " Marvel not that YE MUST BE BORN AGAIN."
Following the initial outpouring of the God' Spirit and the ministry of Peter at Pentecost, the Bible states, "They that gladly received his word were BAPTIZED: and the same day there were added unto them (120 Disciples) about three thousand souls.
Baptism of the water and of the spirit is key to seeing the kingdom of God and it is not optional for all who were baptized in the name of Jesus Christ were born again with fire and spirit. Read the New Testament, especially Acts and Corinthians. You will find that it is a commandment of God to be baptized in the name of Jesus Christ for the remission of sins and the receiving of the Holy Ghost. You become one with the lord Jesus Christ, part of the bride of Jesus Christ, his church.