[American Constitutionalist]

Key verse: " And you hath he quickened, who were dead in trespasses and sins " .... and in a few verses later, it says that he: raised us up .....
Has nothing to do with our own righteousness or " works " ... it was all of God's work and effort.
A man who does his works, and keeps the law, is still dead in his trespasses because it's only by the blood of Christ that can bring a new birth, salvation.

After the tabernacle was built in the wilderness, after the law was given, after the law books where recorded and records kept, after the 1st and 2nd Temples were built, they all still had to be dedicated and sprinkled with animals blood.
Every year, year after year, century after century until Christ came, and then, in 70 AD, there was a day in the year that there was a blood sacrifice for the priest's and the whole nation's sins.
After 70 AD, that sacrificial system stopped..

[MarDav]

And that’s why we may approach the throne of Grace with boldness—we do so in Christ—the name which is above every name. The Father’s estimation of His Son’s work on the cross is that it is the ONLY WORK that God acknowledges as righteous (all other works are as filthy rags!)

So, coming to the Father by way of the Son (and the cross) is as a sweet aroma to God, as the perfume of the sacrifice of His Son is a sweet savor! Full atonement is made for sin. I approach His Throne, He sees His Son and is satisfied. The Father now inclines His ear to me, His redeemed child and He gives attention to my [feeble] request and like a loving Father, grants these in accordance with His will.