First, biblical Judaism, no longer exists. The ceremonial law after the destruction of the Temple was impossible to fulfill. The ceremonial law is no longer relevant. It was fulfilled by Christ.

Gal. 4:9-11, 5:1 but now that ye have come to know God, or rather to be known by God, how turn ye back again to the weak and beggarly rudiments, whereunto ye desire to be in bondage over again? Ye observe days, and months, and seasons, and years. I am afraid of you, lest by any means I have bestowed labor upon you in vain. … For freedom did Christ set us free: stand fast therefore, and be not entangled again in a yoke of bondage.
Add to this the fact that the term “forever” may also be translated “all the days of your life” (i.e. Ps. 23:6, etc.) and we have the idea of “all the days of Israel’s existence.” Since, Passover was fulfilled by Christ (and now by His church) this translation seems most fitting.

Secondly, biblically speaking, there are only spiritual Jews. Gentiles that have been saved are spiritual Jews. Jews that are believers are spiritual Jews. Biblically speaking, it is no more a people of race – but grace (please note, it was always a people of grace (Rom. 2:28-29), but we see the covenant in the OC often accomplished thru the people of race – God’s chosen people).

Gal. 3:26-29 For ye are all sons of God, through faith, in Christ Jesus. For as many of you as were baptized into Christ did put on Christ. There can be neither Jew nor Greek, there can be neither bond nor free, there can be no male and female; for ye all are one man in Christ Jesus. And if ye are Christ's, then are ye Abraham's seed, heirs according to promise.
Thirdly, most in the early church understood Christ as the fulfillment of Passover, and the celebration of Christ’s resurrection as the proper mode of Passover observance. This should be all Christians understanding and practice (1 Cor. 5:7-8). This article may help (somewhat). For the Sabbath (binding moral law) please read, The Covenantal Sabbath and the shorter The Perpetuity and Change of the Sabbath. You may find other articles on the Sabbath here (Praxis/Sabbath).

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Reformed and Always Reforming,