As a Protestant Christian though I need to point out that that belief simply cheapens Jesus Christ and Christianity and turns it into a really selfish "What's in it for me" con job.
I disagree. My belief is that Jesus Christ was in the beginning with His Father. He was before He was born and He IS after he died.
I fail to see how this doctrine cheapens Christianity in any way.
Perhaps you have read this:
Nicene Creed writes:
I believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible.
And in one Lord Jesus Christ, the only-begotten Son of God, begotten of the Father before all worlds; God of God, Light of Light, very God of very God; begotten, not made, being of one substance with the Father, by whom all things were made.
Who, for us men and for our salvation, came down from heaven, and was incarnate by the Holy Spirit of the virgin Mary, and was made man; and was crucified also for us under Pontius Pilate; He suffered and was buried; and the third day He rose again, according to the Scriptures; and ascended into heaven, and sits on the right hand of the Father; and He shall come again, with glory, to judge the quick and the dead; whose kingdom shall have no end.
And I believe in the Holy Ghost, the Lord and Giver of Life; who proceeds from the Father and the Son; who with the Father and the Son together is worshipped and glorified; who spoke by the prophets.
In my belief, God is good and good alone. To call God both good and evil turns Him into a pantheistic oneness, rather than a monotheistic absolute. God created good and evil, to be sure, but it was a necessary foreknown to allow for free will.
If you had a kid, for instance, and commanded him to stay inside and not to venture outside, he could
not disobey you
if there was no outside. He would by default have to stay inside. (in communion) Lucifer, according to some tradition, was originally an angel in communion with God and the rest of them. Only by choosing to rebel did Lucifer get cast out(hence the need for an outside). By the same token, humans are aware of good and evil and are responsible to choose whether to do evil(go outside) or choose good.(remain in communion)
One analogy that I like to use regarding a Trinitarian concept involves the Sun(analogous to God "in Heaven") the Light(Jesus Christ, the light of the world)and the heat or warmth(of the Holy Spirit). Jews know or believe there is a sun in the sky. They feel the warmth. They cannot, however see the light.
John 9:39--Jesus said, "For judgment I have come into this world, so that the blind will see and those who see will become blind."
For whatever reason, so the dogma goes, the Jews were blinded to the reality of a Messiah. I believe that God is good, however, and the good guys win in the end.