S Luke's Gospel sometimes puzzles people. On the one hand, not least in the Infancy Narratives, it repeatedly emphasises the the Torah-rootedness of everything our Lady and S Joseph do; on the other, it seems to have the Mission to the Gentiles as one of its main themes. I will not attempt a long lesson on this point, upon which commentators advance different opinions, but simply share what seems to me S Luke's thrust: the Jewish people were and continue to be God's People; but some of them do reject the Messiah. To the Faithful Remnant - those Jews who do receive their Messiah - God adds Gentile converts. And that is what the Christian Church is; God's ancient Hebrew people (minus the unbelieving) with associate Gentiles.
This means, incidentally, that Jewish Christians, far from being an oddity or an anomaly, are witnesses to the age-old identity of the Church. It means that the Church did not begin in the first century AD, but when God first Called a People in the dimmest antiquity of Semitic history: a point emphasised by the Roman Canon when it calls Abraham our Patriarch. S Gregory the Great calls it, "The Universal Church, which from righteous Abel right down to the the last to be chosen who shall be born in the end of the world". This means that Christianity is not a religion which grew out of Judaism, but - in historical terms - one of the two successor bodies resulting from a split in first century Judaism; at a time when, in any case, the literal fulfilment of the religion of the the Hebrew Scripures became technically obsolete with the destruction of the Temple and the end of the Temple cult. We, and Rabbinic Judaism, both claim to be the Real McKoy. And we both, to an outsider looking in, inevitably appear different not only from each other but also from the Temple-centred religion which ended in AD 70.
My understanding is that when Rabbinic Judaism remoulded itself as a religion without the Temple sacrificial system, it became radically different (there are scholars who have queried whether synagogues actually existed before AD 70; I think this is an overstatement, but there can be no doubt that the significance of the synagogue was transformed after AD 70). Christianity retained the inherent sacrificial structure and grammar of Hebrew religion, fulfilled in the Eucharistic Sacrifice instituted on the first Maundy Thursday.
As the distinguished American rabbinic scholar Jacob Neusner has pointed out, what Jesus ejected from the Temple were those selling animals to enable the Temple's sacrificial worship to be carried out, and the moneychangers who enabled pilgrims to bring the shekel-tax which paid for the great daily morning and evening Tamid sacrifice of a lamb, offered for the whole People. Our Lord thereby enacted the replacement of the Temple cult by the Sacrifice which He Himself was to institute the following Thursday; Lamb superseding lamb, Altar superseding altar, Table superseding table; when Antitype (as we Christians put it) superseded type.
Sunday by Sunday, perhaps day by day, we go up to Jerusalem and enter into the courts and tabernacles of YHWH in great joy to offer there the Thanksgiving oblation of the Lamb, and to share YHWH's Communion Sacrifice, our feet upon the hill-top where Abraham stood with Isaac and where the Seed of Abraham was immolated.