The trinity doctrine, is a false doctrine of Man that teaches ANOTHER JESUS as warned in the Bible at – 2nd. Cor. 11: 3,4).
That is to say, it teaches a Jesus that greatly differs from how Jesus spoke of himself in clear SIMPLE language throughout scripture.
In 325, the Council of Nicaea adopted a term for the relationship between the Son and the Father that from then on was seen as the hallmark of orthodoxy; it declared that the Son is “of the same substance” (?????????) as the Father. This was further developed into the formula “three persons, one substance.”
The Council of Nicaea was reluctant to adopt language NOT FOUND IN SCRIPTURE, and ultimately did so only after one particular man showed how all strictly biblical language could also be interpreted to support his belief that there was a time when the Son(Jesus) did not exist. Proverbs 8: 22 – 31
The Confession of the Council of Nicaea said little about the Holy Spirit. The doctrine of the divinity and personality of the Holy Spirit was developed by Pope Athanasius I of Alexandria (c 293 – 373) in the last decades of his life.
Athanasius eventually “invented dialogue to ridicule his adversaries”, and used “suppression and distortion” to serve his own means.
With that in mind, and with the fact that the Council of Nicaea was reluctant to adopt language NOT FOUND IN SCRIPTURE, but ultimately did so, THERE IS REASON FOR TRINITARIANS to question this man made doctrine and the motives behind it.
The Bible gives these warnings:
James 3: 14 – 16 says,
 But if ye have bitter envying and strife in your hearts, glory not, and LIE NOT AGAINST THE TRUTH.
 This wisdom descendeth not from above, but is earthly, sensual, devilish.
 For where envying and strife is, there is confusion and every evil work.
Matthew 15: 9 says,
 But in vain they do worship me, teaching for doctrines the commandments of men.