The Early Christians Were Unanimous!
(Baptism is how one is "Born Again"!)

It is impossible to find one early Church Father who referred to (John 3:5) “Amen, amen, I say to you, no one can enter the kingdom of God without being born of water and spirit.” as anything other than baptism. They are unanimous baptism is how one is born again!

Tertullian - 203 A.D.
"No one can attain salvation without baptism, especially in view of the declaration of the Lord, who says, `Unless a man shall be born of water, he shall not have life'"

Cyprian of Carthage - 253 A.D.
"When they receive also the baptism of the Church . . . then finally can they be fully sanctified and be the sons of God . . .since it is written, `Except a man be born again of water and of the spirit, he cannot enter into the kingdom of God'"

Council of Carthage VII - 256 A.D.
"And in the gospel our Lord Jesus Christ spoke with his divine voice, saying, `Except a man be born again of water and the Spirit, he cannot enter the kingdom of God.' . . . Unless therefore they receive saving baptism in the Catholic Church, which is one, they cannot be saved, but will be condemned with the carnal in the judgment of the Lord Christ"

Athanasius - A.D. 360
"As we are all from earth and die in Adam, so being regenerated from above of water and Spirit, in the Christ we are all quickened"

Ambrose of Milan - 387 A.D.
"The Church was redeemed at the price of Christ's blood. Jew or Greek, it makes no difference; but if he has believed, he must circumcise himself from his sins [in baptism (Col. 2:11-12)] so that he can be saved . . . for no one ascends into the kingdom of heaven except through the sacrament of baptism. . . . `Unless a man be born again of water and the Holy Spirit, he cannot enter the kingdom of God'"