Circumcision saved no one , its purpose was to mark out a people for God.Baptism does the same.
If Baptism saves why did Christ die? John could have saved everyone?
It certainly does that, I'll grant you that. But Paul says "As many of you as are baptized into Christ, have put on Christ." So if baptism is identical to "putting on Christ," and baptism saves no one, then "putting on Christ" saves no one. And I don't think you want to say that.
If Baptism saves why did Christ die? John could have saved everyone?
John's baptism wasn't Christian baptism, just a Jewish purification rite.