https://brit-olam.org/congress/
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"A Non-Jew Who Converts Etc.... He Lucked Out"
Chabad Synagogue gathering in Rostov Russia with 500 Christians!
https://youtube.com/shorts/Ru8qgjd8RAo?si=8tSL7CH0Ty3VIq_N
https://youtube.com/shorts/-Z4eFnHCRqA?si=h1MUVlkm4XoAXN5l
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Halachic Sources:
הרב משה פיינשטיין: אגרות משה
Rav Moshe Feinstein took a considerably stricter position than Rav Soloveitchik.
His responsa include:
שו"ת אגרות משה, יורה דעה, חלק ג', סימן מ"ג
אף שמה שידבר כתר"ה יהיה במילי דעלמא, פשוט וברור שהוא איסור חמור של אביזרייהו דע"ז...
ולכן כל מגע ומשא עמהם אף בדברים בעלמא ועצם ההתקרבות הוא אסור באיסור החמור דהתקרבות לע"ז.
These responsa address organized meetings between Jewish and Christian religious representatives. Rav Moshe objected to such gatherings on halachic grounds, including the concern that they constituted an impermissible rapprochement with Christianity and its religious institutions.
He also objects to the participation of rabbis in such gatherings because their presence could encourage other Jews to participate in missionary activities.
What was the actual issue?
Rabbi Lander had promised to attend a gathering involving Catholics, Protestants and Jewish representatives, including rabbis.
Even though his intended remarks concerned general matters rather than theology, Rav Moshe strongly opposed his attendance.
This is particularly significant: Rav Moshe was addressing not merely participation in Christian prayer, but attendance at an organized interreligious gathering itself.
Source: הרחבות לפניני הלכה, מפגשים וקשרים עם אנשי דת נוצרים.
פניני הלכה, הרב אליעזר מלמד, פרק י״ג, הלכה י׳, מפגשים עם אנשי דת.
This last source discusses both the prohibition advanced by Rav Moshe Feinstein and the more permissive approach of Rav Soloveitchik and other Orthodox authorities.
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Addendum to the Original Edition of “Confrontation”
By Rabbi Joseph B. Soloveitchik
Published in A Treasury of Tradition, Hebrew Publishing Company, 1967, pages 78-80.
Read the complete addendum on the Rabbinical Council of America websiteRead the original scanned PDFHe then specifically identifies subjects that should not become part of such interfaith theological discussions:
Judaic monotheism and the Christian idea of the Trinity.
The Messianic idea in Judaism and Christianity.
The Jewish attitude toward Jesus.
The concept of the Covenant in Judaism and Christianity.
The Church and the Synagogue, their sanctity and metaphysical nature.