God is triune. He is one being, in trinity. This means, one being, three persons. Father, (πατήρ) Son, (υἱός) and Holy Spirit. (πνευματι αγιω) God is eternal. He has always existed just as He is. He has never, not existed. Everything that is, has been made by Him. Everything is sustained by Him. All persons of the Trinity have likewise always existed, as one being, one God. God’s nature/attributes are immutable. This means He never changes. He has never changed. He has always been as He is. He has always been the Trinity. The incarnation at advent did not change His nature. The hypostatic union did not change the deific nature of God, as the two natures were perfectly joined without mixing. A human is one being, in one person. A dog is not a person at all, but is one being. We don’t have any trouble believing in a being that isn’t a person at all, like the dog, but when it comes to God as one being, and three persons we stumble. God is omnipresent. God is in all places, during all times, and times without time. He is in the future, present, and the past. He exists in the in between spaces we now call hyperdimensional space. To be in all places includes hyperdimensional space. If you think about it, that almost necessitates a being who is more than one person. Here is a short video that attempts to explain the Trinity. It does a pretty decent job, but some of course it can’t do a perfect job.
It is amazing to me how accurate the men were who composed this creed considering the time that it was written in. Remember, the word, “catholic” here does not have anything to do with the Roman Catholic Church. It is from the Greek word, “katholikos” and means universal.
1. Whosoever will be saved, before all things it is necessary that he hold the catholic faith;
2. Which faith except every one do keep whole and undefiled, without doubt he shall perish everlastingly.
3. And the catholic faith is this: That we worship one God in Trinity, and Trinity in Unity;
4. Neither confounding the persons nor dividing the substance.
5. For there is one person of the Father, another of the Son, and another of the Holy Spirit.
6. But the Godhead of the Father, of the Son, and of the Holy Spirit is all one, the glory equal, the majesty coeternal.
7. Such as the Father is, such is the Son, and such is the Holy Spirit.
8. The Father uncreated, the Son uncreated, and the Holy Spirit uncreated.
9. The Father incomprehensible, the Son incomprehensible, and the Holy Spirit incomprehensible.
10. The Father eternal, the Son eternal, and the Holy Spirit eternal.
11. And yet they are not three eternals but one eternal.
12. As also there are not three uncreated nor three incomprehensible, but one uncreated and one incomprehensible.
13. So likewise the Father is almighty, the Son almighty, and the Holy Spirit almighty.
14. And yet they are not three almighties, but one almighty.
15. So the Father is God, the Son is God, and the Holy Spirit is God;
16. And yet they are not three Gods, but one God.
17. So likewise the Father is Lord, the Son Lord, and the Holy Spirit Lord;
18. And yet they are not three Lords but one Lord.
19. For like as we are compelled by the Christian verity to acknowledge every Person by himself to be God and Lord;
20. So are we forbidden by the catholic religion to say; There are three Gods or three Lords.
21. The Father is made of none, neither created nor begotten.
22. The Son is of the Father alone; not made nor created, but begotten.
23. The Holy Spirit is of the Father and of the Son; neither made, nor created, nor begotten, but proceeding.
24. So there is one Father, not three Fathers; one Son, not three Sons; one Holy Spirit, not three Holy Spirits.
25. And in this Trinity none is afore or after another; none is greater or less than another.
26. But the whole three persons are coeternal, and coequal.
27. So that in all things, as aforesaid, the Unity in Trinity and the Trinity in Unity is to be worshipped.
28. He therefore that will be saved must thus think of the Trinity.
29. Furthermore it is necessary to everlasting salvation that he also believe rightly the incarnation of our Lord Jesus Christ.
30. For the right faith is that we believe and confess that our Lord Jesus Christ, the Son of God, is God and man.
31. God of the substance of the Father, begotten before the worlds; and man of substance of His mother, born in the world.
32. Perfect God and perfect man, of a reasonable soul and human flesh subsisting.
33. Equal to the Father as touching His Godhead, and inferior to the Father as touching His manhood.
34. Who, although He is God and man, yet He is not two, but one Christ.
35. One, not by conversion of the Godhead into flesh, but by taking of that manhood into God.
36. One altogether, not by confusion of substance, but by unity of person.
37. For as the reasonable soul and flesh is one man, so God and man is one Christ;
38. Who suffered for our salvation, descended into hell, rose again the third day from the dead;
39. He ascended into heaven, He sits on the right hand of the Father, God, Almighty;
40. From thence He shall come to judge the quick and the dead.
41. At whose coming all men shall rise again with their bodies;
42. and shall give account of their own works.
43. And they that have done good shall go into life everlasting and they that have done evil into everlasting fire.
44. This is the catholic faith, which except a man believe faithfully he cannot be saved.
So to sum things up, if you don’t believe and worship the Triune God, you’ve made an idol to worship. If you find that you, in your ignorance had been worshipping a god that is not the God of the Bible, please repent. The true God of scripture is faithful and just to forgive you if you come to Him in faith and repentance. Jesus, the Eternal Son paid the price for all of your sins on the cross, including wrong beliefs about Him. Confess, and ask forgiveness. If you are one of His sheep, He will be your Lord and Master. He will be your good shepherd. By the will of the Father in election, and the regenerating, convicting work of the Holy Spirit as your seal for redemption, and the justifying work of the Son on the cross, all three persons are at work in the gospel justifying sinners to Himself.