I am starting off with a series titled "Explanations for Christianity". This post and several of the following will be an attempt to put forth basic yet complex, and commonly misunderstood, themes of Christianity.
The first post is "The Trinity".
3-In-1 God (The Trinity) – Many people argue that Christianity is a polytheistic system of belief, meaning Christians worship more than one God. Three to be exact. This is not true. We believe in One God, who is united as three persons, The Father, The Son, and The Holy Spirit. This is where the term Trinity comes from. The Bible states in many passages that God is love, not to say that love is God, but the essence of who God is, is pure, unconditional (agape) love. One way of defining love is - a self-less act or expression toward someone else without condition. In order for God to be love he would have to be multi-person. God could not love if He is only one person because there would be no one else to bestow the love to. Genesis 1:26 says, "Then God said, "Let Us make man in Our image, according to Our likeness; and let them rule over the fish of the sea and over the birds of the sky and over the cattle and over all the earth, and over every creeping thing that creeps on the earth." God refers to Himself as "us" & "our" and He does it in a book that was written long before Jesus became flesh on Earth. Also, in the book of Genesis it states that in the beginning God existed before all of creation. God does not change. He does not need to because He is perfect in Himself. This means God was always love. Therefore, before all of creation, only God existed and in order for him to be love while being by Himself, He would have to be made up of more than one person. Three persons as One God.