[annalex]

I made a reference to Apostolic Canon 45, prohibiting prayer with heretics and schismatics.

Pope Pius X is not the only source of reference, you know.

The re-examination of the Church vis-a-vis the Jewry occurred in the wake of the Second World War and creation of the state of Israel, when it became clear that the Jews have an distinct role in the fabric of the Western Civilization and as a whole do not bear hostility to Christians, whereas often the hostility of the Christians toward the Jews is a gross failure of Christian charity. The Church therefore in her pastoral duty to the Christian world, undertook to ensure that the Jews as a group not be treated as anti-Christian religious community.

[annalex]

A better reference is to both canons 45 and 65, see Holy Canons Related to Ecumenism

The source is Orthodox but the canons themselves are from the Undivided Church.

[ebb tide]

Pope Pius X is not the only source of reference, you know.

Are you saying the saint is wrong? It sounds like you are.