Acts 16:31 So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.”
Paul saw the jailer about to destroy himself and shouted, "Do thyself no harm: for we are all here" (Acts 16:28). The jailer called for a light and came in trembling before Paul and Silas and said, "Sirs, what must I do to be saved?" Paul responded, "Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house" (Acts 16:31).
You might not want to stop reading at this verse, remember, context , context, context,,, read on.. "And they spake unto him the word of the Lord, and to all that were in his house. And he took them the same hour of the night, and washed their stripes; and was baptized, he and all his, straightway. And when he had brought them into his house, he set meat before them, and rejoiced, believing in God with all his house" (Acts 16:32-34).
You're trying to leave the impression that all that was necessary for the jailer to do to be saved was to believe in Jesus Christ. The answer which Paul gave to this jailer must be understood in its context. When this man asked what he had to do to be saved, he was an unbeliever. The first thing that an unbeliever must do to be saved is to become a believer. Paul's answer was, "Believe on the Lord Jesus . . . ." the next thing that the text states is.... that Paul spake unto him the word of the Lord. This man could not become a believer before he heard the word of the Lord... He had to hear the word of the Lord and believe it before he could be saved. How does faith come? By hearing the word of the Lord.
After he had heard the word of the Lord preached, he took them and washed their stripes. Sounds like what Paul did (Acts 22:16)
The text relates that the jailer was baptized "the same hour of the night" (Acts 16:33). Why was this man baptized in the middle of the night? Why did Paul go to so much trouble to baptize this man immediately? You would have the Jailer saved the moment he accepted Jesus as his personal Savior and that at some convenient time the church would have a baptismal service at which time he would be baptized.
Paul baptized this man in the middle of the night because it had everything to do with his eternal salvation. The question which was asked pertained to eternal salvation; it was, "What must I do to be saved?" The reply was, "Believe on the Lord Jesus ...." When the jailer returned from having been baptized, the Scriptures relate that he rejoiced then, "believing in God with all his house" (16:34). His response to the gospel in baptism was understood as what was necessary to make him a believer, one who is a child of God.