We worship one God in three persons and three persons in one God, without confusing the persons or dividing the divine Being. For the Father is one person, the Son is another, and the Holy Spirit is another. But the deity of the Father and of the Son and of the Holy Spirit is one, equal in glory, coequal in majesty.
Such as the Father is, such is the Son, and such is the Holy Spirit. Uncreated is the Father; uncreated is the Son; uncreated is the Holy Spirit. The Father is infinite; the Son is infinite; the Holy Spirit is infinite. Eternal is the Father; eternal is the Son; eternal is the Holy Spirit. And yet they are not three who are eternal, but one who is eternal, just as they are not three who are uncreated, nor three who are infinite, but one who is uncreated and infinite.
Almighty is the Father; almighty is the Son; almighty is the Holy Spirit. And yet they are not three who are almighty, but one who is almighty.
So the Father is God, the Son is God, the Holy Spirit is God; and yet they are not three gods, but one God. So the Father is Lord, the Son is Lord, the Holy Spirit is Lord; and yet they are not three lords, but one Lord. For just as Christian truth compels us to confess each distinct person as God and Lord, so the catholic faith forbids us to speak of three gods or three lords.
The Father was neither made nor created nor begotten; the Son was neither made nor created, but was alone begotten of the Father; the Holy Spirit was neither made nor created, but is proceeding from the Father through the Son. Thus, there is one Father, not three Fathers; one Son, not three Sons; one Holy Spirit, not three Holy Spirits. And in this Trinity none is before or after, greater or less than the other; but all three persons are in themselves coeternal and coequal, so that in every way, as stated before, the Trinity in Unity and Unity in Trinity is to be worshiped. Therefore, whoever wishes to be saved must think thus about the Trinity.
But it is also necessary for everlasting salvation that one faithfully believe that our Lord Jesus Christ took on human flesh. For this is the true faith that we believe and confess: That our Lord Jesus Christ, the Son of God, is at the same time both God and man. He is God from the Being of the Father before all ages, and He is man from the being of His mother in this age: Fully God and fully man, composed of a rational soul and human flesh; equal to the Father with respect to His divinity, less than the Father with respect to His humanity.
Although He is God and man, He is not divided, but is one Christ. He is one, not by changing the divinity into flesh, but by taking the humanity into God; fully one, not by confusion of human and divine being, but by unity of person.
For as the rational soul and flesh is one man, so God and man is one Christ. He suffered for our salvation, descended into hell, rose the third day from the dead, ascended into heaven, and is seated at the right hand of the Father, God Almighty, from where He will come to judge the living and the dead. At His coming all people will rise bodily and give answer for their deeds. Those who have done good will enter into eternal life, and those who have done evil into eternal fire.
This is the catholic faith. Whoever does not faithfully and firmly believe this will not be saved.
Below is a Word document, which is part of our bulletin for Holy Trinity. This is how we confess the Athanasian Creed interspersed with hymn singing.