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I disagree. This verse is pretty clear about those who do not "continue" in faith...

Romans 11:17 If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, 18 do not consider yourself to be superior to those other branches. If you do, consider this: You do not support the root, but the root supports you. 19 You will say then, "Branches were broken off so that I could be grafted in." 20 Granted. But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but tremble. 21 For if God did not spare the natural branches, he will not spare you either. 22 Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off.

Additionally, the entire book of Hebrews is written to Messianic Jews who are defecting back to rabbinic Judaism.

Ephesians 2

Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;) And hath raised us up together, and made us sit together in heavenly places in Christ Jesus: That in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus. For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. 1For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.

NOT OF YOURSELVES, It is the GIFT of God, Not of works, lest any man should boast.