I was answering to somebody else's question, and said that the passage from John was talking both about baptism and a spiritual rebirth. He claimed that the water referred to part of the process of physical birth to which i disagreed.
Okay I see. The baptism itself is a public declaration to do God's will by becoming a follower of Jesus Christ and doing the work he did and exercising faith (practicing continually) what Jesus taught. As far as the symbolism of the water, it's like dying to a former way of life and being reborn to a new course spiritually speaking.
The old nation of Israel with it's Mosaic Law was merely a physical representation of of the reality of the Christ. I believe this is mentioned in Hebrews where the Law is called a tutor leading to Christ. All through the ages when God dealt with the Israelites as a special property (chosen people) ONLY because of the promise God made to Abraham, it was for the purpose of illustrating just how God views matters in a litter way on Earth (something Adam and Eve rejected) and of course the lineage of the promised Seed mentioned at Genesis 3:15
. For centuries this had been called a sacred secret because gradually over time prophecies over time would reveal just who this promised one was. The Jews were a fleshly materialistic minded people. The majority rejected Christ while a handful accepted him and got baptised. In a sense it was a spiritual rebirth. Jews who accepted Christ could see the value of practicing not just an actual Law, but the principles and standards behind the law, something the Jewish religious leaders could never comprehend.
Hence at Pentecost, we see all those being literally publically baptised with water immersion, also receiving out pouring of holy spirit. They were the foundation of God's new chosen people. The fact that they had miraculous abilities to heal, perform other miracles and speak in other languages to further the spreading of Christianity around the then known world also served to publically serve notice of God's rejection of Israel as a nation and backing this new spiritual Israel which encompased people from every nation. Something the Jews also resented, but yet was the promise God had promised to Abraham that by means of his Seed, all the nations (those who accepted) would bless themselves.
Sorry if this is a bit long winded, but as far as a physical rebirth, no. When those with the heavenly hope are resurrected, they receive a spirit body since the heavenly realms are nothing physical as we relate to things here on Earth. This is what Jesus emphazised with the Samaritan woman who claimed her people worshipped physically at a specific holy mountain, but Jews say Jerusalem. Jesus told her times were soon to change because worship of the father would be neither in that holy mountain nor Jerusalem, but people would learn to worship God with spirit and truth. This would bind all Christians with unity no matter what race, nationality, language , culture, social standing, financial status, etc. Unfortunately much of the various Churches conduct since the death of the Apostles hasn't always followed these principles, something which Jesus himself and the Apostles foretold would happen after their deaths.