In God’s Image June 10, 2018 9:30 a.m., Sanctuary The Trinity is both mysterious and central to Christianity. It is the belief that God exists as three persons, but is one being, having a single divine nature. The members of the Trinity – Father, Son, and Holy Spirit – are co-equal and co-eternal, one in essence, nature, power, action, and will. The Trinity is both relational and of one essence.