This seems an appropriate time to remind us all of the Solemn Definition of Florence forbidding, in the most drastic terms, any use of the ritual Law of the Old Testament:
The sacrosanct Roman Church, founded by the voice of our Lord and Saviour … firmly believes, professes, and teaches that the matter pertaining to the law of the Old Testament, of the Mosiac law, which are divided into ceremonies, sacred rites, sacrifices, and sacraments, because they were established to signify something in the future, although they were suited to the divine worship at that time, after our Lord’s coming had been signified by them, ceased, and the sacraments of the New Testament began; and that whoever, even after the passion, placed hope in these matters of the law and submitted himself to them as necessary for salvation, as if faith in Christ could not save without them, sinned mortally. Yet it does not deny that after the passion of Christ up to the promulgation of the Gospel they could have been observed so long as they were believed to be in no way necessary for salvation; but after the promulgation of the Gospel it asserts that they cannot be observed without the loss of eternal salvation. All, therefore, who after that time observe circumcision and the Sabbath and the other requirements of the law, it declares alien to the Christian faith and not in the least fit to participate in eternal salvation, unless someday they recover from these errors. Therefore, it commands all who glory in the name of Christian, at whatever time, before or after baptism, to cease entirely from circumcision, since, whether or not one places hope in it, it cannot be observed at all without the loss of eternal salvation.
– The Council of Florence 1438-1445 (17th Ecumenical Council) Cantate Domino, 4th February 1442 [D712]
This prohibition is phrased in such serious terms because of the objective significance of these rites. To perform them (especially the Passover Meal itself) is equivalent to standing up and raising your right hand and saying “I solemnly swear that the Messiah has not yet come nor has he suffered for our sins”. Not a good thing to say. I suspect that the peculiar prevalence of Judaising practices among Christians today is a consequence of the pernicious doctrine of implicit faith. The doctrine of Florence that the performance of these rites whether or not one places hope in them is incompatible with salvation makes an absurdity the implicit faith idea. If it is not the truth but just the willingness in principle to believe the truth which sets one free then it makes no sense to say that the rites of the Old Law are dead and deadly. They ought to be the single most efficacious bearers of the imaginary salvific implicit faith. Thus the modernist pelagian fable that it is possible to be saved without faith in Jesus Christ meets its doom before Florence’s condemnation of the Judaisers.