Really? Look again at this thread centering on Acts chapter 8. About the conversion of the Ethiopian. Clearly Philip was preaching the gospel which evidently included baptism in water.
To deny that a physical baptism is essential unto salvation is just false doctrine.
We are not under the law, we are under grace. We are given the Gospel of the grace of God now. Centered on the FINISHED WORK OF CHRIST. TOday there is ONE BAPTISM. Which has nothing to do with water. And everything to do with the work of the HOLY SPIRIT baptizing us into the Body of Christ. It's spiritual. Not physical. You can read all about it in Romans through Philemon, and starting in Acts chapter 9. Imagine that! You were just ONE CHAPTER away from knowledge of the dispensation of the grace of God.