This is not a personal opinion. It is the weight of scripture. Just as you said yourself, it takes more than one verse to nail down an interpretation. So here are 15 more verses that agree with Jn.3:15.
Jn.1:12,3:18,5:24,17:3,17
Acts 10:44, 11:14,17
Rm. 4:5, 5:1,10:9,10
Eph.2:8
Jms.1:21
1Pt.1:23
1Jn.5:1
John then says in 1Jn.5:13 “These things have I WRITTEN unto you. …that ye may know that ye have eternal life. …” In ALL these things there is no mention of BAPTISM or COMMUMION.
This is why i believe have the weight of scripture on my side. But if there is more to support your side ,then I’m going with you.
It’s still only your personal interpretation of the meanings of all those passages. Here’s a few on the importance of Baptism that I found.“Acts 10: [47] Then Peter answered:
Can any man forbid water, that these should not be baptized, who have received the Holy Ghost, as well as we? [48] And
he commanded them to be baptized in the name of the Lord Jesus Christ.”
“Acts 19: [2] And he said to them:
Have you received the Holy Ghost since ye believed? But they said to him: We have not so much as heard whether there be a Holy Ghost. [3] And he said:
In what then were you baptized? Who said: In John’ s baptism. [4] Then Paul said:
John baptized the people with the baptism of penance, saying: That they should believe in him who was to come after him, that is to say, in Jesus. [5] Having heard these things,
they were baptized in the name of the Lord Jesus. [6] And
when Paul had imposed his hands on them, the Holy Ghost came upon them, and they spoke with tongues and prophesied.”
“John 4:[1] When Jesus therefore understood that the Pharisees had heard that
Jesus maketh more disciples, and baptizeth more than John, [2] (Though Jesus himself did not baptize, but his disciples,) [3] He left Judea, and went again into Galilee.”
“Romans 6: [3] Know you not that
all we, who are baptized in Christ Jesus, are baptized in his death? [4] For
we are buried together with him by baptism into death; that as Christ is risen from the dead by the glory of the Father,
so we also may walk in newness of life. [5] For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection. [6] Knowing this, that
our old man is crucified with him, that the body of sin may be destroyed, to the end that we may serve sin no longer. [7]
For he that is dead is justified from sin.”
“Ephesians 4: [1] I therefore, a prisoner in the Lord,
beseech you that you walk worthy of the vocation in which you are called, [2] With all humility and mildness, with patience, supporting one another in charity. [3]
Careful to keep the unity of the Spirit in the bond of peace. [4]
One body and one Spirit; as you are called in one hope of your calling. [5]
One Lord, one faith, one baptism.”
“1 Peter 3: [18] Because Christ also died once for our sins, the just for the unjust:
that he might offer us to God, being put to death indeed in the flesh, but enlivened in the spirit, [19] In which also coming he preached to those spirits that were in prison: [20] Which had been some time incredulous, when they waited for the patience of God in the days of Noe, when the ark was a building: wherein a few, that is,
eight souls, were saved by water. [21]
Whereunto baptism being of the like form, now saveth you also: not the putting away of the filth of the flesh, but the examination of a good conscience towards God by the resurrection of Jesus Christ. [22] Who is on the right hand of God, swallowing down death,
that we might be made heirs of life everlasting: being gone into heaven, the angels and powers and virtues being made subject to him.”
“Matthew 3: [13]
Then cometh Jesus from Galilee to the Jordan, unto John, to be baptized by him. [14] But John stayed him, saying: I ought to be baptized by thee, and comest thou to me? [15] And Jesus answering, said to him: Suffer it to be so now.
For so it becometh us to fulfill all justice. Then he suffered him. [16] And
Jesus being baptized, forthwith came out of the water: and lo, the heavens were opened to him: and he saw the Spirit of God descending as a dove, and coming upon him. [17] And behold a voice from heaven, saying: This is my beloved Son, in whom I am well pleased.”
“Mark 16: [15] And he said to them: Go ye into the whole world, and preach the gospel to every creature. [16]
He that believeth and is baptized, shall be saved: but he that believeth not shall be condemned. [17] And
these signs shall follow them that believe: In my name they shall cast out devils: they shall speak with new tongues. [18] They shall take up serpents; and if they shall drink any deadly thing, it shall not hurt them:
they shall lay their hands upon the sick, and they shall recover. [19] And the Lord Jesus, after he had spoken to them, was taken up into heaven, and sitteth on the right hand of God. [20] But they going forth preached everywhere: the Lord working withal,
and confirming the word with signs that followed.”
“Mathew 28: [18] And Jesus coming, spoke to them, saying: All power is given to me in heaven and in earth. [19]
Going therefore, teach ye all nations; baptizing them in the name of the Father, and of the Son, and of the Holy Ghost. [20]
Teaching them to observe all things whatsoever I have commanded you: and behold I am with you all days, even to the consummation of the world.”
(all emphasis mine)