According to the way you reason since that verse doesn't say anything about faith, then faith doesn't produce forgiveness of sins; it's the fruit of forgiveness.
That’s a clever but flawed counter by you, and it’s based on a logical fallacy — you are attempting a category error by misrepresenting what Ephesians 1:7 is doing in the flow of Paul’s argument. Ephesians 1:7 is identifying what secures forgiveness — Christ’s blood — not how it’s received.
Paul elsewhere explains the receiving instrument plainly: ‘through faith in his blood’ (Rom 3:25 KJV).
Faith connects us to the finished work of Christ’s blood; baptism testifies to it after the fact.
Scripture never reverses that order or makes water the conduit of grace.
You seem to be approaching Scripture through a very narrow lens — likely shaped by the traditions or teachings of your group rather than by sound exegesis. It’s hard to see the fullness of biblical truth when interpretation is filtered through indoctrination instead of letting Scripture interpret Scripture.
Grace and Peace