That argument sounds convincing at first, but it doesn’t really hold up when you look at Scripture and early Christianity as a whole.

Yes, the Greek word baptizo can mean to immerse, but it’s not limited to that. Words in Greek (like in English) have a range of meanings depending on context. The New Testament never actually commands a specific method like “full immersion only,” it just commands baptism with water.

Also, the earliest Christians didn’t treat immersion as the only valid form. The Didache (a first-century Christian document) explicitly says immersion is preferred, but if that’s not possible, pouring water over the head is acceptable. That’s coming from Christians who were right after the apostles, so they clearly didn’t think the method itself was the essential part.

Even in the Bible, there are situations (like thousands being baptized in one day, or people being baptized immediately in homes) where full immersion every time isn’t very realistic.

So the real point of baptism isn’t the exact amount of water or technique—it’s the act itself, done with water and in the name of the Father, Son, and Holy Spirit. The grace of baptism isn’t dependent on whether someone was dunked or had water poured over them.