Agreed. The Scriptures are quite clear that there is but one baptism. It is by water and the Spirit, but one only - the one we submit to as in Acts 2:38.
Jesus commanded we be baptized. Mk 16:16, Mt 28:18ff
Peter taught we need to be baptized. Acts 2:38ff
Peter further explained that baptism was the point at which we receive the gift of the Holy Spirit Acts 2:38 (cf. Acts 19:2ff)
C.f. Rom 8:9 where Paul explicitly asserts that anyone who does not have the Holy Spirit does not belong to Him
Paul explained the why of baptism:
-- As the sharing in the death, burial, and resurrection of Christ. Rom 6:1ff, Col 2:9ff (cf. Gal 2:20)
-- As how we are put into Christ, become part of the "body" of Christ Col 2:9ff
-- As the basis of our
identity in Christ. I Cor 1:10-13
Luke records baptism as part of the process of becoming a Christian in multiple locations:
-- The 3000 Acts 2:37ff
-- Simon, the Samaritans Acts 8:12ff
-- The Ethiopian Eunuch Acts 8:26ff
-- Saul (Paul) Acts 9:1-19 & Acts 22:3-16
-- Cornelius and his household Acts 10:44ff
-- Lydia and her household Acts 16:25ff
-- The jailer in Philippi and his household Acts 16:25ff
It is interesting (and very saddening) that what most people
think they know about baptism has virtually zero Scriptural basis.
The above (and other passages) are quite clear, explicit, and concrete. There are no magical, mystical, or esoteric explanations needed to understand what they're saying; no mystery, no profoundly intricate explanations necessary. They are simple, straightforward, consistent with one another and with the rest of Scripture.
Ps 119:160 - "The SUM of Thy Word is truth..."