Byzcat,
If one were to boil the multitude of protestant heresies into 1 over-arching error, it would be the rejection of the real Christ, through the rejection of His VISIBLE church and a return to "loving" God like the Jҽωs did in the Old Law - faith (in Christ's sacrifice) and reading of Scripture. All the protestants did was replace faith in the Redeemer for faith in Christ's death and reading of the Old Testament for reading of (most) of the Old and New. They deleted scripture references to priesthood, church, sacrifice, etc because they reject the New Law. They rejected the real Christ and created an Old Testament version of Him. The Jews totally rejected Christ; Protestantism rejected parts of Christ.
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When you argue that the Old Law salvation has to be the same as the New Law, you are arguing from a protestant mindset. You're a good poster and intelligent, but you need to recognize you've still got some protestant scars left to heal.