Good point.
For clarification, here is St. Paul’s baptism in
Acts 9 (NAB):
17 So Ananias went and entered the house; laying his hands on him, he said, “Saul, my brother, the Lord has sent me, Jesus who appeared to you on the way by which you came, that you may regain your sight and be filled with the holy Spirit.”
18 Immediately things like scales fell from his eyes and he regained his sight. He got up and was baptized,
19 and when he had eaten, he recovered his strength.
Please, excuse me if this has already been covered:
In Acts 9:18, the context does not support baptism by immersion. In verse 11, St. Paul is said to be in the “house of Judas.” In verse 17, Ananias meets St. Paul as he “entered the house.” This indicates that St. Paul was baptized in the house of Judas. There is no record of seeking a large pool of water in or outside the city of Damascus. Rather, it is intimated that Ananias used what was convenient in the house of Judas. Secondly, verse 18 indicates that as soon as St. Paul “rose” he was baptized. The scene is depicted such that St. Paul is standing in the house of Judas and is being baptized. There is no intimation that Ananias sought out a large pool of water in which to immerse St. Paul. The context suggests that Ananias would have chosen the simpler method of pouring or sprinkling water on St. Paul.
In the history of the Catholic Church, two basic modes of baptism were practiced. The first was aspersion (sprinkling) or affusion (pouring); the second was immersion. Both forms, for the most part, existed sidebyside. As early as the second century, however, pictures on the walls of Roman catacombs depict the baptismal candidate standing in water, upon which another figure is pouring water from a vessel on the head of the recipient. This is more or less the picture described in Mt 3:13-16 in which Jesus is baptized by John and then “came up out of the water.”
Later, Church Fathers such as Cyprian and the writers of the Didache supported affusion, the latter stipulating clinical necessity and triune affusion. Other fathers, however, such as Tertullian and Chrysostom, advocated triune immersion, such that the recipient was immersed three times in water to coincide with the formula of Mt 28:19 “baptizing them in the name of the Father, and of the Son, and of the Holy Spirit.” Later, Pope Gregory I allowed single immersion along with triune immersion in an effort to symbolize both the Unity and Trinity of the Godhead against Arian polytheism. Immersion as a whole was more popular in the warmer climates of Africa and southern Europe, triune immersion being practiced more in the Eastern Churches.
Since infant baptism was the doctrinal standard of the early church, sprinkling became the more convenient mode of baptism, probably due to the fragility of the infant. By the time of Aquinas, he allowed both immersion and sprinkling, while Duns Scotus and Bonaventure preferred immersion.