The Bible reveals God is only one God.  So Christianity is considered a monotheistic religion.  Yet, from the very first chapter in the Bible, we learn that there is some kind of plurality within God.

#108 God Is Almighty and Sovereign

For 2000 years, the followers of Jesus have been on a mission, even as Jesus himself was on a mission.  Often wrongly understood as “saving souls,” this mission of Jesus actually is about bringing people into a new kingdom, a new reality.  Life in this new kingdom requires not only a change of heart and mind, but a change in life-purpose and worldview.  As Jesus himself observes, there are not many people who will want this change.  But for those who are changed by God inwardly, life in this new kingdom, brings new meaning and purpose in life.  Everyone who becomes part of this new kingdom finds that almost all their prior beliefs, ideas, attitudes, and perspectives become turned “upside down.”