Ancient history

Why do Christians and Muslims pilgrimage to the Virgin house in Ephesus Were united religion at some point as Catholic Greek Orthodox were?

Christians and Muslims do not pilgrimage to the "Virgin house" in Ephesus. The House of the Virgin Mary is a Catholic and Greek Orthodox shrine located on Mount Koressos in the vicinity of Ephesus in present-day Turkey. It is traditionally believed to be where Mary, the mother of Jesus, spent the last years of her life, although this belief is not universally accepted by all Christians.

Catholics and Greek Orthodox are part of different branches of Christianity and have their own distinct traditions and beliefs. Christianity is not united as a single religion, and there have been theological differences and divisions among various denominations throughout history.