Muslims, Jews, Jehovah’s Witnesses, and Mormons say yes. They insist that the orthodox Christian doctrine of the Trinity is unbiblical and is a hangover from the polytheism of Greek and Roman mythologies. Is this true? Or is believing in a three-in-one God foundational to biblical faith?

To help answer these questions, RBC senior research editor Herb Vander Lugt has written the following pages to show what the Bible says about the relationship between the Father, Son, and Holy Spirit. It is our prayer that this booklet will help you to see why followers of Christ believe in a three-in-one God, and why this doctrine of the Trinity has such great significance.

Martin R. De Haan II