Mathetes, I think it ironic that the anonymous "mathetes" of the famous early writing "Epistle of Mathetes to Diognetus" regarded the sect of rabbinic judaism with some contempt:
"And next, I imagine that you are most desirous of hearing something on this point, that the Christians do not observe the same forms of divine worship as do the Jews. The Jews, then, if they abstain from the kind of service above described, and deem it proper to worship one God as being Lord of all, [are right]; but if they offer Him worship in the way which we have described, they greatly err. For while the Gentiles, by offering such things to those that are destitute of sense and hearing, furnish an example of madness; they, on the other hand by thinking to offer these things to God as if He needed them, might justly reckon it rather an act of folly than of divine worship. For He that made heaven and earth, and all that is therein, and gives to us all the things of which we stand in need, certainly requires none of those things which He Himself bestows on such as think of furnishing them to Him.
But those who imagine that, by means of blood, and the smoke of sacrifices and burnt-offerings, they offer sacrifices [acceptable] to Him, and that by such honours they show Him respect,--these, by supposing that they can give anything to Him who stands in need of nothing, appear to me in no respect to differ from those who studiously confer the same honour on things destitute of sense, and which therefore are unable to enjoy such honours.
But as to their scrupulosity concerning meats, and their superstition as respects the Sabbaths, and their boasting about circumcision, and their fancies about fasting and the new moons, which are utterly ridiculous and unworthy of notice,--I do not think that you require to learn anything from me. For, to accept some of those things which have been formed by God for the use of men as properly formed, and to reject others as useless and redundant,--how can this be lawful? And to speak falsely of God, as if He forbade us to do what is good on the Sabbath-days,--how is not this impious? And to glory in the circumcision of the flesh as a proof of election, and as if, on account of it, they were specially beloved by God,--how is it not a subject of ridicule?
And as to their observing months and days, as if waiting upon the stars and the moon, and their distributing, according to their own tendencies, the appointments of God, and the vicissitudes of the seasons, some for festivities, and others for mourning,--who would deem this a part of divine worship, and not much rather a manifestation of folly? I suppose, then, you are sufficiently convinced that the Christians properly abstain from the vanity and error common [to both Jews and Gentiles], and from the busy-body spirit and vain boasting of the Jews; but you must not hope to learn the mystery of their peculiar mode of worshipping God from any mortal."