Who Is God?

How do we know who God is? We know who God is from His creation, from His Word - the Bible, and from His Son Jesus Christ. God is one God in three persons, also called the Trinity. God is God the Father, God the Son, and God the Holy Spirit. New City Catechism explains who God is this way: God is the creator of everyone and everything. It might be hard to understand who God is, but that doesn't mean that He is not real.