In Christianity, there is only one God.
In essence, there is no three disconnected deities, but three distinct Persons in unison of will, power, knowledge, love, mercy, justice, holiness, etc. (1).
The whole Bible speaks of YHVH (YAHWEH for pronunciation), the only one LORD God. The Father, Son, and Holy Spirit are equally God, and in one Nature.
As a hindsight, God is spirit, as written in John 4:24. Hence, we hardly able to comprehend God from our physical perspective. However, Jesus the Son, came in the form of both God and man to live among man in the early A.D., so that we can relate to God through Him.
- Perman, M. 2004. What is the doctrine of the trinity? Retrieved from: http://www.desiringgod.org/articles/what-is-the-doctrine-of-the-trinity
- Stanley, C. (n.d.). The roles of the trinity? Retrieved from http://www.jesus.org/is-jesus-god/holy-trinity/the-roles-of-the-trinity.html