Weatherhead's theory that Jesus was the son of Zechariah later became part of the teachings of Sun Myung Moon's Unification Church. Encountering it in Weatherhead's "The Christian Agnostic", Unificationist theologian Young Oon Kim adopted it as the best explanation of the birth of Jesus in her work "Unification Theology", a standard textbook of the church. Christian author Ruth A. Tucker comments in her book "Another Gospel": "Kim's Christology is a prime example of liberal theology... By diminishing the role of Jesus, Kim paves the way for the exaltation of Sun Myung Moon."