I really should not butt in here, but I believe the Bible is clear that there actually are two "baptisms". The first, and the only one that counts, occurs at the instant that a person obtains a true, heart-felt belief in Jesus as the only Savior who died for all sinners (as a perfect, flawless, sinless propitious sacrifice to God) and then arose three days later, the first-fruits of all those who find salvation in God. When that belief is obtained, the Holy Spirit enters into that believer's body to reside there for the rest of that person's life on earth. It is at that instant of entrance that a person is born again in the Spirit of God. Since God is both perfect and all-knowing, no one who receives the Holy Spirit in this manner can possibly lose their salvation because God cannot make a mistake. He already knows who will love Him, and who will reject Him.
The other baptism is "water" baptism by full emersion. This is a symbolic act of public admission to complete subservience to Jesus that does not in any way actually result in a person's salvation. I have read arguments (debates?) that claim that water baptism is necessary for salvation, but anyone who adheres to that thought process does not really understand God or how He works. He is omnipotent and omniscient, being all powerful and all knowing. He does not need man's assistance with anything, including the process of salvation. That process is His alone to freely bequest on those individuals who believe in Jesus as the Savior and who repent of their sinful ways. He gently calls all persons to come unto Him by action of the Holy Spirit, but He never forces His will on anyone. If they heed His call, and if they follow the narrow pathway He has clearly laid before them, they will find salvation. If they ignore His gentle call, they will remain under His wrath at the judgement. And if they ignore His call enough times, He will give up on them and even harden their hearts so they cannot possibly find salvation.
Just some of my thoughts,
Rank Stranger