You must not dissociate yourself from Church

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!’

http://reference.bahai.org/en/t/ab/ABL/abl-53.html#pg98