Unitarianism
The Son of God is a being that existed before Jesus' human life. It is called the Logos who dwelt with God in the beginning and then was born as the man Jesus. However, he is not eternal, but had a beginning of existence. God created him. This theology is commonly called Arianism, but there are many varieties of this form of Unitarianism. They range from the belief that the Son, before he came to earth, was a divine spirit of the same nature as God to the belief that he was an angel or other lesser spirit creature of a wholly different nature from God. Arius' views are only one variation of this theology.