Baptism is a simplification of the Jewish purification rituals. It is a SYMBLE of forgiveness of sins. The ritual is not important. The forgiveness of our sins is the important part. Jesus told us how he felt about rituals in the story of the good Samaritian. The priest would not help his fellow man because he had been ritually cleansed. The ritual stood in his way of doing the right thing.
Don't get too hung up on rituals. Everytime you say the Lord's Prayer, you are in effect being baptised