How could one regard it since it is not in Scripture. The trinity is not just three persons/one God, but all three are co-equal and co-eternal. Neither is in Scripture.
If you read the Bible it sticks out when you read it that this is the case, it's the Holy Spirit that confirming this as true and it's all throughout the Bible, I will read through a passage and then go back and their it is that's the Trinity staring you in the face, and such just blows you away. yes their it is confirmed with great joy that you found it.
If one is carnal nothing much will come about by reading your Bible and the Bible confirms this fact, so all the so called Christians who are on a mans works doctrine are lost as to the Holy Spirit as they are only much just like the Pharisees, lost as to God
Only people who are carnal can not work out the Trinity, I did not understand it once my self and I know that every Atheist rejects such a thing and it's no wonder that they can't get a handle on it, because they have not received the Holy Spirit as they are not born again.
Carnal religious men are into a mans works doctrine as they claim to bringing in the kingdom that their carnal works will bring about the ends that they claim will save the world and that's why we have a new age ratbag mob who rattle on about the 2ed coming as their main mantra and idolise so called Jews like the Talmud Whore as that's who dominates over such people. it's the we are bringing in the Kingdom lie, fact is that no one comes to he Father but through his only begotten Son. so for a fact it can't come from outside of Christ Jesus himself because any other is idolising and under the influence of the Anti-Christ.
What is an Anti-Christ well anyone who rejects Jesus Christ as their Lord and Saviour or puts anything in front of him higher in their lives.