Catholic encyclopedia:
https://www.newadvent.org/cathen/02033b.htm
So there is One Father, not Three Fathers; one Son, not Three Sons; One Holy Ghost, not Three Holy Ghosts. And in this Trinity none is afore or after Other, None is greater or less than Another, but the whole Three Persons are Co-eternal together, and Co-equal
Who, then, is the author? The results of recent inquiry make it highly probable that the Creed first saw the light in the fourth century, during the life of the great Eastern patriarch, or shortly after his death
The "damnatory", or "minatory clauses", are the pronouncements contained in the symbol, of the penalties which follow the rejection of what is there proposed for our belief. It opens with one of them: "Whosoever will be saved, before all things it is necessary that he hold the Catholic Faith". The same is expressed in the verses beginning: "Furthermore, it is necessary" etc., and "For the right Faith is" etc., and finally in the concluding verse: "This is the Catholic Faith, which except a man believe faithfully and firmly, he cannot be saved". Just as the Creed states in a very plain and precise way what the Catholic Faith is concerning the important doctrines of the Trinity and the Incarnation, so it asserts with equal plainness and precision what will happen to those who do not faithfully and steadfastly believe in these revealed truths..
.From a dogmatic standpoint, the merely historical question of the authorship of the Creed, or of the time it made its appearance, is of secondary consideration.
The fact alone that it is approved by the Church as expressing its mind on the fundamental truths with which it deals, is all we need to know.]
Have you ever questioned rather or not God is a trinity or one according to the Bible?
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1- Maybe people don’t want to question or think about things that might change the way they see things. They only want to know about things that confirm how they see things. If they come across anything that might challenge how they see things they just quickly walk away, they don’t want to know.
2- The statement in the Trinitarian creed that “None is greater or less than Another” regarding the Father, the Son and the Holy Spirit seems to go against the statement of Jesus as reported in John 10:29 that "My Father (meaning God), who has given them to me, is greater than all”
3- Also if “the Creed first saw the light in the fourth century, during the life of the great Eastern patriarch, or shortly after his death” then it means it wasn’t taught by Jesus or any of the disciples he talked to.
4- In addition to the declaration of Jesus in John 10:29 he made it very clear in John 17:3 that the Father is “the ONLY true God”
5- It is very puzzling how anyone knowing all the evidence against the trinity would still continue to believe in it.