I think there are clear parallels between Baptism and circumcision.
Great this helps a lot that you can see the parallels.
What we say about one we must be able to say about the other
What you are talking about here is Typology. But you are not giving it a proper definition.
A
type is a person, thing, or event in the Old Testament that foreshadows something in the New Testament. It is like a taste or a hint of something that will be fulfilled or realized. Types are like pictures that come alive in a new and exciting way when seen through the eyes of Christ’s revelation.
Augustine said that “the Old Testament is the New concealed, but the New Testament is the Old revealed” (
Catechizing of the Uninstructed 4:8).
For instance St. Paul who told us that circumcision foreshadowed Christian Baptism in Col 2:11-12 also told us in Rom 5:14 that Adam was a type of Christ. We would never say we that means they must be the same and since Adam sinned Christ must have sinned also.
In Typology the New Testament realities are always greater than their Old Testament Types.
Jesus, the new Adam being greater than Adam.
Baptism, the NT sign of the New Covenant is greater (does more) than it’s OT type circumcision.
Does that make sense?
So how could Baptism remove original sin?
Because Jesus promised it would. Jesus instituted the sacrament of Baptism when he entered the water to be baptized. He instructed the Apostles to Baptize every nation (Matthew 28:19)
I heard once an easy way to think of the Sacraments is they are actions of the Holy Spirit who brings about the very reality they signify. Basically, God said you get wet I’ll give you grace and remove original sin. It’s not some work we do to force God’s hand. That’s the way He set it up He gave us a Sacrament so we can have assurance that when we perform the Sacrament(worthily) He will give us the Grace.
The Church teaches…
"At Baptism all sins are forgiven, original sin and personal sin, as well as all punishment for sin." CCC1263
Also does the church teach baptism is necessary for salvation?
The Church teaches…
God has bound salvation to the sacrament of Baptism…He himself is not bound by His sacraments." CCC1257
Basically, in a nut shell yes. Why because Jesus wants us to be Baptized. Now if we aren’t Baptized sure God can still save us if He so desires, but wouldn’t you rather do what God asks instead of what you want.
Because I believe that all that is required is faith showing itself through love.
Yes this is very important by you need to ask yourself why you believe this is ALL that is required?
After all if Jesus asks you to be Baptized and you say to Jesus nah I’ll pass, don’t really agree with that, do you believe your faith is showing through you love of Christ.
Hope this helps,
God Bless