It doesn't need to be. Baptism was done with water; that is what it is, unless something in the context indicates otherwise.
Act 8:36 And as they were going along the road they came to some water, and the eunuch said, “
See, here is water! What prevents me from being baptized?”
Act 8:38 And he commanded the chariot to stop, and they both went down into the
water, Philip and the eunuch,
and he baptized him.
Act 8:39 And when they came up out of the water, the Spirit of the Lord carried Philip away, and the eunuch saw him no more, and went on his way rejoicing. (ESV)
Act 10:47 “
Can anyone withhold water for baptizing these people, who have received the Holy Spirit just as we have?”
Act 10:48 And
he commanded them to be baptized in the name of Jesus Christ. Then they asked him to remain for some days. (ESV)
1Pe 3:20 because they formerly did not obey, when God's patience waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight persons,
were brought safely through water.
1Pe 3:21
Baptism, which corresponds to this, now saves you, not as a removal of dirt from the body but
as an appeal to God for a good conscience, through the resurrection of Jesus Christ, (ESV)
Baptism never stopped.
Apart from your explicit claims to be an expert, which
hawkman has provided, claiming to be "one of the most knowledgeable guys on the planet concerning the subject of the resurrected Christ Jesus," is an implicit claim to be an expert.
No one is making that claim. It is that the Word became flesh in the person of the Son, named Jesus.
Yet, John 1:1a means that when the beginning began, the Word was already in existence. In other words, the Word is eternal. John 1:1b means that the Word was in intimate, personal union and communion with God. That does not apply to "purpose and plans," but to persons. Then we see in 1:1c that the Word is divine in nature. Can "purpose and plans" be said to actually be in nature God? Are your words actually human in the same sense that you are human?
We should look at John 1:2, where it is a concise repeat of verse 1. And in verse 3, we see that all things were made through the Word, which again supports the idea that the Word is uncreated and eternal. Why is all that important? Because of the rest of the context:
Joh 1:10 He was in the world, and
the world was made through him, yet the world did not know him. (ESV)
Who is the "He" spoken of? Clearly it is the Son, Jesus. This is important because of the clear claim that "the world was made through him," that is, through the Son. There is simply no way around this. John clearly makes the case that the Word is uncreated and eternal, and was in an interpersonal relationship with God, and was God in nature. It is this Word through which "without him was not any thing made that was made."
Joh 1:18 No one has ever seen God;
the only God, who is at the Father's side, he has made him known. (ESV)
Here John concludes his description of the Son by summing all the previous verses. Most ancient evidence, and the best manuscripts, support the reading "God only begotten," not that it matters since that is what John has already stated.
There is no preexistence of Jesus, per se, since that is the name given to the humanity of the Son of God, but the preexistence of the Son of God, known also as the Word, is without question. Salvation depends on this being the case, which is precisely why John's whole epilogue is about who Jesus is--both divine and human.
His epilogue sets the stage for the rest of his gospel and all that he says about Jesus, which is why his gospel is filled with implicit and explicit claims to the divine nature of Jesus.