Everyone agrees with your statement, “Scripture PLAINLY states that baptism forgives sins.”
The disagreement comes from the fact the Scripture speaks of one baptism. Anyone that can read knows the Bible speaks of an inward Spiritual and an outward physical baptism. Which do you think carries more weight with God?
No Christian I know of speaks against being physically baptized in water, what they do protest is the claim by some that they are not saved until they get wet.
That phrase comes straight from
Ephesians 4:4–6:
“There is one body and one Spirit… one Lord, one faith, one baptism, one God and Father of all…”
Here’s the plain-spoken meaning
One faith-
The shared belief in Jesus Christ—His life, death, resurrection, and lordship.
Not many saving systems, denominations, or formulas. One gospel, one trust.
One baptism—
The unifying reality of being identified with Christ and brought into His body.
Paul’s emphasis here is unity, not technique.
Elsewhere he explains that this happens by the Spirit:
“For by one Spirit we were all baptized into one body” (1 Corinthians 12:13).
Big picture
Paul isn’t listing rituals to check off. He’s grounding Christian unity in what God has already done:
One Savior
One message
One people
One transforming work that brings us into Christ
Water baptism fits as an outward sign and obedience, but the verse itself points to the shared spiritual reality, not a requirement that divides believers by method, timing, or medium.