August 5. On this date in 1955, a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of the British Isles stated that "As regards the question of Bahá'ís belonging to churches, synagogues, Freemasonry, etc.,...the necessity for them to support whole-heartedly their own institutions and cut themselves off entirely from those of the past, is now clearer than ever before."

August 5. On this date in 1955, a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of the British Isles stated that "As regards the question of Bahá'ís belonging to churches, synagogues, Freemasonry, etc.,...the necessity for them to support whole-heartedly their own institutions and cut themselves off entirely from those of the past, is now clearer than ever before."

This prohibition contradicted earlier statements by 'Abdu’l-Bahá. On February 18, 1912, "The Pittsburgh Pennsylvania Press" featured an article stating "In some respects the Bahá’í movement is the most remarkable of modern times. It isn’t a religion, in the sense that Christianity and Mohammedism and other faiths are religions. Its followers belong to many diverse sects, remaining Christian or Mohammedan or Brahmin as the case may be, and still being thorough going Bahis." During his visit to London in 1911, 'Abdu’l-Bahá had stated that "You can be a Bahá’í-Christian, a Bahá’í-Freemason, a Bahá’í-Jew, a Bahá’í-Muḥammadán."

1387. Bahá'ís Belonging to Churches, Synagogues, Freemasonry and the Like
"As regards the question of Bahá'ís belonging to churches, synagogues, Freemasonry, etc., the friends must realize that now that the Faith is over 100 years old, and its own institutions arising, so to speak, rapidly above-ground, the distinctions are becoming ever sharper, and the necessity for them to support whole-heartedly their own institutions and cut themselves off entirely from those of the past, is now clearer than ever before. The eyes of the people of the world are beginning to be focused on us; and, as humanity's plight goes from bad to worse, we will be watched ever more intently by non-Bahá'ís, to see whether we do uphold our own institutions wholeheartedly; whether we are the people of the new creation or not; whether we live up to our beliefs, principles and laws in deed as well as word. We cannot be too careful. We cannot be too exemplary.
"There is another aspect to this question which the friends should seriously ponder, and that is that, whereas organizations such as Freemasonry may have been in the past entirely free from any political taint, in the state of flux the world is in at present, and the extraordinary way in which things become corrupted and tainted by political thought and influences, there is no guarantee that such an association might not gradually or suddenly become a political instrument. The less Bahá'ís have to do, therefore, with such things, the better."
(From a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of the British Isles, August 5, 1955)

During his visit to London in 1911, 'Abdu’l-Bahá had the following interaction with a Christian...

A student of the modern methods of the higher criticism asked ‘Abdu’l-Bahá if he would do well to continue in the church with which he had been associated all his life, and whose language was full of meaning to him. ‘Abdu’l-Bahá answered: “You must not dissociate yourself from it. Know this; the Kingdom of God is not in any Society; some seekers go through many Societies as a traveller goes through many cities till he reach his destination. If you belong to a Society already do not forsake your brothers. You can be a Bahá’í-Christian, a Bahá’í-Freemason, a Bahá’í-Jew, a Bahá’í-Muḥammadán. The number nine contains eight, and seven, and all the other numbers, and does not deny any of them. Do not distress or deny anyone by saying ‘He is not a Bahá’í!’

Numerous statement by Shoghi Effendi would later contradict these statements, with Bahá’ís being explicity prohibited in associating with any other faiths.