Stop thinking of the “Jewish Synagogue” as the model for Paul’s churches.We must remember that first-century Jews were Judeans. Interpreters should not, in principle, segregate Judeans from Greeks, Romans, Egyptians, and so on by creating something suspiciously like a modern religion called Judaism. Even Jews who lived permanently in Rome or Alexandria were Judeans living outside of their traditional homeland and therefore similar to Syrians, Greeks, or Egyptians who lived abroad.
Judean worship was similar to the worship of other gods
Before 70 C.E. Jewish worship, even in the Diaspora, was centrally focussed on the temple in Jerusalem. The great temple festivals, tabernacles, pentecost, passover, were celebrated by Judeans throughout the empire. These were agricultural festivals that celebrated the gifts of produce and livestock that God gave his people, of success in trading and in acquiring the blessings of children.
Temple time with its agriculturally oriented calendar shaped the calendar of the Jews (sic) in general. Pilgrimage to Jerusalem for the festivals and sacrifices was a major feature of the period. Many Judeans of the Diaspora directly participated in the temple cultus sometime during their lives. The temple tax that supported the daily sacrifices in the temple and the first fruit offerings that signified the ancient pattern of reciprocity and divine giving of productivity were among the major yearly efforts of Diaspora communities.
What of the place of the scriptures? It is generally agreed that the reading of scriptures was a very important for the religious life of Judeans.
The Torah, Prophets, and Psalms are . . . absolutely dominated by the centrality of the temple, priesthood and cult. The epics and myths of Judeans were about land, people, and socio-economic reciprocity with God and other Judeans. . . For Judeans, unlike for Christians, to study scripture was to be oriented toward an actual temple, a place where reciprocity with the divine was enacted in the imagined exchange of produce from the land and shop, womb and market.
Judean religion was focused on the idea of reciprocal exchange with God. God blessed his people; his people offered sacrifices and gifts and communal worship in return. And the temple was the focus of this exchange. The religion of a Judean living 500 miles from Jerusalem differed little in principle from the one living 20 miles away.
Other cultural groups, those from places other than Judea, throughout the empire, recognized these Judean religious customs as counterparts to their own.
The dominant activities of the temple were sacrificial offerings of grain and animal products. Judeans shared these practices with Greeks, Romans, and most peoples of the Mediterranean world. Josephus proudly proclaims that Judeans share the practices of sacrificing domestic animals with “all the rest of humanity” (Ag. Ap., 2.137). (p. 85, my bolding)
Pauline Christianity did not look like a typical religion
— Paul has no altar to Hephaestus in his shop
— and he does not belong to an association of leather workers with a calendar of sacrificial feasts.
— He does not tell myths about how God or the gods gave human crafts, land, and agricultural skills so that they could possess the goods of human life.
— Nor does he instruct members of his churches to collect first fruits and tithes for the temple in Jerusalem.
— He tells those who have business dealings to act as if they were of no importance (1 Cor 7:30-31).
— He does not see his work as a source of goods for supporting a valued way of life organized as a household, but as an instrument to aid his work in teaching others the Christ myth (1 Cor 9:1-27; 4:11-13; 1 Thess 2:9).”
Early Christian groups did not look anything like the above religious communities. They lacked temples ties to land animal and other types of sacrifice agricultural festivals or festivals for other types of productivity.
They also lacked rituals and other practices related to intergenerational continuity, not having rituals for birth and death sacrificial practices related to purification from birth and death pollution sacred spaces, i.e. altars, so that purity and pollution became moral metaphors nothing like circumcision no marriage rituals or sacrifices (Paul did not even encourage marriage!)
All that is missing here constituted the heart of ancient religion.
Such practices contributed towards ethnic identification. Earliest Christianity did not emulate contemporary religious praxis. Paul’s Christians organized themselves differently.So did the followers of Hellenistic philosophies.