First of all, being born again and salvation are two different things.
Being born again means you put to death your flesh and be born of the spirit. The Holy Spirit actually comes down and lives inside of you and guides your life on earth.
Salvation means forgiveness of our sins and eternal life in heaven.
Two different things.
Being born again through baptism is the first step to salvation.
It is not just simply believing in Jesus that saves you.
Through baptism, we are forgiven of our original sin, and all sins up to that point, and the Holy Spirit enters us leaving an indelible mark on our souls, which will last forever making us children of God.
The fall of Adam cut us from being called children of God, while Jesus’ sacrifice on the cross has brought us back to being children of God. Jesus gave us baptism as the means that we are born again, forgiven of sins and recieve the Holy Spirit, so we can once again become children of God.
I don’t know how much clearer it can be than the following verses.
John 3:3
“Truly, truly, I say to you, **unless one is born anew, he cannot see the kingdom of God.” **
John 3:5
"Truly, truly, I say to you,
unless one is born of water and the Spirit, he cannot enter the kingdom of God.
John 3:22
After this Jesus and his disciples went into the land of Judea; there he remained with them and
baptized.
John 2:23 - 25
Now when he was in Jerusalem at the Passover feast,
many believed in his name when they saw the signs which he did;
but Jesus did not trust himself to them, because he knew all men and needed no one to bear witness of man; for he himself knew what was in man.
.
John 1:12-13
But to all who received him, who believed in his name,
he gave power to become children of God;
who were born, not of blood nor of the will of the flesh nor of the will of man, but
of God.
Ezekiel 36:25 - 27
** I will sprinkle clean water upon you, and you shall be clean from all your uncleannesses,** and from all your idols I will cleanse you. A new heart I will give you, and a new spirit I will put within you; and I will take out of your flesh the heart of stone and give you a heart of flesh. And I will put my spirit within you, and cause you to walk in my statutes and be careful to observe my ordinances.
Acts 2:38
And Peter said to them, "
Repent, and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit