The main doctrine of Christendon is that of the Trinity, that there are three divine persons (the Father, the Son, and the Holy Ghost). Each is said to be eternal, and each is said to be almighty; each one is believed to be God but they are lumped together as one single God.
There is only one almighty God who is the Father, the mighty god being his son Jesus, who was God's first creation.The mystery of the Trinity is no more mysterious than unity which is what bonds the Father, the son and the Spirit or God's active force together.