I'll not forget the way you put this a few months ago on another thread. I wrote it down.
You said....."To support the idea of a three in one God head you have to use terms not found in the Bible, rely on false scripture, rely on twisted interpretations that contradict extremely clear scriptures and create a convoluted theory that no one really understands, forcing its adherents to declare it a mystery."
Best description of the "Trinity Doctrine" that I have ever heard.
If you will read John chapters 14 to 17 with an open mind you will find that Jesus speaks of Himself, God, and the Holy Spirit as three distinct intities. Notice specifically the following verses.
14:16 Jesus will pray to God and God will send the apostles another helper.
14:17 That other helper will be the Spirit of Truth (Holy Spirit)
14:25 Jesus had taught them some things while present with them.
14:26 But the Holy Spirit whom the Father will send will teach them all things.
14:28 Jesus is going back to the Father who is "greater than Jesus."
16:7 If Jesus does not "go away", the Holy Sprit will not "Come."
16:12 Jesus still has much to teach them, but they were not yet ready to hear those things.
16:13 They will be taught those additional things at a later date by the Holy Spirit.
The record shows that Jesus kept his word and sent the Holy Spirit to guide the Apostles. (Acts 2:1-4)
The entirety of Hebrews, chapter 1, sets Jesus up as an intity searate and apart from the Father. John 3:16 makes this distinction very clear also.
Notice also Acts 7:55-56 Stephen, while being stoned, being filled with the "Holy Spirit", looked up and saw the heavens opened and Jesus standing at the right hand of God.
Here we see the Holy Spirit, Jesus and God at the same time in different locations and as separate entities.
The same is true following the baptism of Jesus. (Matt 3:16-17) Jesus is coming out of the water, the Holy Spirit is descending in the form of a dove, and God is Speaking from heaven. Again the three separate entities in three separate locations at the same time.
In I Cor 15:24-28 Paul shows the superior authority of God (the Father) over Jesus (the Son).
I could go on for page after page but it is very clear from scripture that the Father, the Son, and the Holy Spirit are three separate and distinct entities always working in perfect harmony and purpose.