John 3:5 Jesus answered, "Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God."
Prior to birth we are surrounded by water. During birth the water breaks and we are physically born. However, we are not spiritually born "born again" until we have complete faith in Jesus.
Among Western-non-Latin Christians, is there a belief that Original Sin is cleansed by baptism?
Not in my Baptist background. We believe Baptism is a public manifestation of a completed act, done to proclaim the new man in Christ. We do not believe it imparts Grace. We believe in the two ordinances (not sacraments because neither imparts grace) communion and baptism.
“Prior to birth we are surrounded by water. During birth the water breaks and we are physically born. However, we are not spiritually born “born again” until we have complete faith in Jesus.”
Do I understand you correctly to say that Baptists believe that the “water” Christ speaks of in John is amniotic fluid?
Do Baptists believe in Original Sin?
The view is held among Reformed (Protestant) Christians that Baptism and the Lord’s Supper are sacraments and do impart grace in a real sense.
The grace which is exhibited in or by the sacraments rightly used, is not conferred by any power in them; neither doth the efficacy of a sacrament depend upon the piety or intention of him that doth administer it: but upon the work of the Spirit, and the word of institution, which contains, together with a precept authorizing the use thereof, a promise of benefit to worthy receivers. (Westminster Confession of Faith, 27:3)Although it be a great sin to contemn or neglect this ordinance [baptism], yet grace and salvation are not so inseparably annexed unto it, as that no person can be regenerated, or saved, without it; or, that all that are baptized are undoubtedly regenerated. (WCF, 28:5)
The efficacy of baptism is not tied to that moment of time wherein it is administered; yet, notwithstanding, by the right use of this ordinance, the grace promised is not only offered, but really exhibited, and conferred, by the Holy Ghost, to such (whether of age or infants) as that grace belongeth unto, according to the counsel of God's own will, in his appointed time. (WCF, 28:5,6)