Peter replied, “Each of you must repent of your sins and turn to God, and be baptized in the name of Jesus Christ for the forgiveness of your sins. Then you will receive the gift of the Holy Spirit. Acts 2:38.
Peter did not promise the people any more than this at the time of the people’s conversion and neither should we. If we do things the way they did it in the Bible God will be pleased, and people will grow up as healthy and productive Christians.