Does saying that we are not under the New Covenant have an impact on the Gospel?

We are justified by faith in the blood of Jesus Christ.  This is the precious blood of Christ, the Son of God who became a man and lived a sinless life and died for our sins according to the scriptures and was raised on the third day according to the scriptures.  Any person who believes this is justified by faith and saved, and it is this simple message that is the power of God unto salvation.  Whether or not we are parties to the New Covenant or beneficiaries of the Everlasting Covenant is secondary.  What purges our sins and reconciles us to God is the blood of Christ Himself and His resurrection testifies that this blood was accepted as a propitiation not only for our sins but the sins of the whole world.  The value of both the Everlasting Covenant and the New Covenant is based on the preciousness of the blood of Christ itself, and it is faith in His blood that justifies us. Anyone who adds that we must understand our relationship to any covenant to be saved, or that we must agree on this issue to have the Gospel correct, is inadvertently corrupting the Gospel by adding conditions to it.