Thank you for the ref in Luke 11.38 (also note Mark 7.4). You cite it as an example of
baptidzo not always meaning immerse or submerge. If you allow this example it would be the only known exception in all of Greek literature (Christian and non-Christian), and that would be rather unusual. Therefore, I would like you to consider that even here, the meaning of dip, immerse, submerge is not out of place.
“[The Pharisee] marvelled that He had not first
ebaptisthe before the dinner.” The Jewish religious ritual referred to is that of washing the hands, not the whole body. In this context it is not unreasonable to let
baptidzo retain its universal meaning as dip, plunge, immerse, submerge - since that is what is envisioned here. Not the pouring of water over the hands, but dipping both hands into a bowl of water, thus immersing them.
Then, also, note the following verse where Jesus says in response: “You Pharisees make the outside of the cup clean, but…” I believe the image here of washing dishes also implies immersing them in water - as is the common practice today.
Therefore, I am of the opinion that this sole exception is not really an exception when viewed in this context… but I agree, it is a relatively minor point because of the otherwise overwhelming and consistent use of
baptidzo throughout all of Greek literature.
The fact is that the Church had the pastoral insight and authority to allow for other forms of baptism and we are content with that.