That was the OT, Jesus fulfilled the old law PERFECTLY for us. Just because something is old does not mean it is correct,
Gal 3:24 Wherefore the law was our schoolmaster [to bring us] unto Christ, that we might be justified by faith.
One of the problems with the Catholic Church is that it is looking for an OT salvation and not the one given by Christ.
I am not talking about the Old Law. I am talking about the posture of obedience to lawful authority in forms of worship, which is always a good virtue to foster and leads, just like it did for 1300 years with the Israelites/Jews, to liturgical and theological stability. God ordered certain things to be done in the Old Testament because He knew that such rituals were a means to the end of fidelity. The strictness and potential punishment, even, were in place because the Israelites were not the beneficiaries of the same graces available to us after the Cross. But, while the strictness of “penalty” in the old rituals is removed in favor of grace, it is still true that ordered worship according to properly established norms achieves the same effect of continuity, unity and fidelity that was the whole *point* to even the Old Testament rituals. THAT is why we do what we do, to transmit faithfully the *same* Faith down through the generations, even aftr two millenia.
We live under grace, not under the Law. But transmitting the Faith through the ages even under the rule of grace requires uniformity of worship, in order to demonstrate unity of belief. Lex orandi, lex credendi. We have it.