In Acts 2:37-40, Peter, filled with the Holy Spirit, preached a powerful message that convicted the hearts of the people who heard it. The people were deeply moved by Peter's words and asked him what they should do. Peter responded with clear instructions:
Repent and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Since I was Born again in 1963, and received the Holy Spirit (as all Born again Christians do), as the result of Southern Baptist outreach, on a Wednesday night in my Bedroom, the following Sunday in the Evening service, I was Baptised by immersion in the three titles.
I wasn't any MORE "saved", and nothing changed, except that I was wetter, and had to change clothes. But I felt that I had been obedient to the Bible indication that a Saved person SHOULD BE baptized. So I was.
Simple as that.
A local Assembly of God Church in Red OAk, TX held a "SPLASH PARTY" a month ago, and baptized about 150 people on profession of faith, in two tanks during morning service.