It refutes your Iconoclast position. By denying the fact that the Incarnation and Redemptive acts of Christ changed the universe (what you're essentially doing), you're denying the necessity of the Incarnation.
Not at all, and that's a completely illogical stretch.
Conversely, by denying that the Torah remains God's eternal standard, you call Him a liar when He says, "I am YHVH, I do not change" (Mal. 3:6) and "God is not a man, that He should lie, Nor a son of man, that He should repent. Has He said, and will He not do? Or has He spoken, and will He not make it good?" (Num. 23:19).
You further call Him a liar when He says, "For assuredly, I say to you, till heaven and earth pass away, one yod (the smallest Hebrew letter) or one tittle (i.e,. the least penstroke will by no means pass from the Torah till all is fulfilled" (Mat. 5:18). Either that, or you think that Heaven and Earth passed away sometime when we weren't looking.
There were only three changes to the Torah:
1) Gentiles with circumcised hearts are given equal brotherhood with born Jews in God's promises (Eph. 2:13-22), even in the eating of the Passover (1 Cor. 5:7-8).There was indeed a change in the universe in the Incarnation and the Cross, but it is not the change you imagine . . . and God did not change the universe just to wink at bowing to statues--Israel's chiefmost sin, for which it was first split, and then sent into exile fore--after doing so.2) Yeshua HaMashiach, the King of the line of Y'hudah, has been given the High Priesthood over the sons of Levi (Heb. 8-10).
3) The curse of the Torah--that is, the curses it pronounces against those who break its commands (Deu. 27-28)--have all fallen on Yeshua at the Cross, so that we who are truly in Him need not fear the penalties for failing to keep it all perfectly (Gal. 3:13--so much for Purgatory!). Thus, the Torah has lost its punative power as the Law of God, but retains its authority as the Teachings (a better translation of Torah) of God.