Good one (about pocket protectors...) which leads to a point. Jews have 613 commandments from G-d in the Torah, (gentiles have 7 by the way... noahide.org) and 7 from our sages, these 620 have may offshoots and subcategories of course, like pocket protection, or say, flicking a light switch on Shabbos. When you say “no takanos” it’s codeword for heretic (scary word for one who does not believe in the written and oral Torah given to Moses by G-d on Mount Sinai.) So your proof doesn’t fit the test case anymore. Not Orthodox Jews and can’t therefore prove to me how they, Orthodox Jews, disagree with a fundamental teaching of Jewish orthodoxy, ie, we are now in the 11th day (on the east coast) of the 4th month in the 5773rd year from when...wait for it...NOT from when G-d said,” Let there be...” but rather from when He created man on the 6th day. That my friend, is some serious Jew-stuff.
“Jew” covers all of the descent of Judah.
The Jews that hold to Torah, and Torah alone are the true seed that will be saved as explained by Paul in Romans ch 10. Those know that there is no oral Torah, and that only the unchanging written scriptures are from YHVH.
One of the key attributes of a true prophet is that they know that YHVH and his Torah change not. Takanot changes Torah, and the nature of YHVH.
BTW, we are actually near the end of the 6012th Biblical year.
Do you fear the curses of Deuteronomy 28 for the failure to earn the promises? That scripture has some harsh pronouncements.