Eph. 2:8-9Cute. Didn't we just dicuss this? Want to start over? Read verse 10. Grace gives us faith and prepares our good works so we should walk in them.
Your interpretation again is off and the Magisterium is no help, again.
A fellow Catholic does not agree with your interpretation of Eph 2:8-10 and considers it a bad argument.
"Citing Ephesians 2:10 against justification by faith alone. This passage, even rightly interpreted, contains nothing inconsistent with Protestant theology. Having been saved by grace through faith, we ought to do the good works which God prepared beforehand for His children to do. This statement does not require that these good works should themselves be salvific, but is consistent with the supposition that these works are merely the necessary outgrowth of a salvation already completed. In order to establish that good works are salvific, the Catholic must look elsewhere."
http://www.pugiofidei.com/unsound.htm
Rom 4:4 Now to the one who works, his wages are not counted as a gift but as his due. 5 And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness, 6just as David also speaks of the blessing of the one to whom God counts righteousness apart from works:
My argument is that Eph 2:1-10 is consistent with the Catholic theology. Whether or not it is also consistent with the Protestant theology was not a subject treated by me in any way. If some Protestants agree with it, good for them.