Even the Roman Catholic Comments on Eph.2:8-9 deny what you are saying about it referring to Jewish Law.
8 For by grace you are saved through faith: and that not of yourselves, for it is the gift of God. 9 Not of works, that no man may glory.
Comment- Not of works... as of our own growth, or from ourselves; but as from the grace of God. (emphasis added).
http://www.newadvent.org/bible/eph002.htm
My goodness that sounds PROTESTANT!
almost left out this, which makes those comments legimate Roman Catholic statements-
Imprimatur. +James Cardinal Gibbons, Archbishop of Baltimore, September 1, 1899
Nihil Obstat!