I know that Trinitarians don't assume that. The mystery to me is why not?Only if one assumes multiple persons means multiple gods. Trinitarians don't assume that. You do and impose that interpretation onto Scripture resulting in confusion.
Because, Scripture doesn't allow us to. Scripture teaches, not just our interpretation, Scripture teaches eternal personal distinctions between the Father, Son and Spirit; Scripture teaches the Father is God, the Son is God, and the Holy Spirit is God; and Scripture teaches there is only one God. Therefore, one must either reject this assumption, or reject Scripture. I reject the former, while you reject the later.
If something quacks like a duck and looks like a duck, the plainest explanation is that it is a duck.
No one is quacking like a duck. I'm not the one who said "Father glorify me with the glory I had with you before the world was." John 17:5. I am not the one who said to Jesus "Sit at my right hand, until I put your enemies under your feet.” Psalm 110:1. I'm not the one who said "I saw in the night visions, and behold, with the clouds of heaven there came one like a son of man, and he came to the Ancient of Days and was presented before him." Daniel 7:13. I am not the one who said "No one has ever seen God; the only God, who is at the Father’s side, he has made him known." John 1:18. I can go on and on. You can hold to this concept of seems like that to me a human when describing the interworkings of the One, Necessary, Unique, True God, but I would rather not reject Scripture as to make my theology less complicated.
What Trinitarians often do is describe the three persons as though they were three God's, but since the bible says there is one God, then what they describe is just one God. Case closed. Period, Why question such brilliance? Is that how it goes?
When? You say "Trinitarians often do is describe the three persons as though they were three God's", but you don't dare to quote anything? Is this because you know Trinitarians don't actually do this, or are you afraid all of the times you think we do that, you are just misunderstanding us?
Other than the three persons enjoying a perfect "unity", what else do you have in your description of these three persons that would support your claim that they are one God?
Scripture's repeated drumbeat that there is only one God. The difference between us is that we accept everything Scripture says. You shift Scripture through a theological/philosophical screen accepting only parts of Scripture while rejecting the rest. Arians believe Jesus and the Father are so distinct that they are two entities base upon certain passages. You believe in oneness to the extent that you deny any eternal distinction between them based upon other passages. We accept both sets of the passages as to believe they are one God while not rejecting their distinctions. Trinitarianism is the fix between the extremes of Oneness and Arianism. All one has to do is accept that what seems like common sense for those in the human world doesn't necessarily apply to the Divine.
You say that the Father has a literal face that is looking at the other literal face of his Son. This means that they both , at a minimum, have their own faces. Do they share the same body, like a three headed being or do each of the persons have their own bodies? Does the Holy Spirit person also have a face that looks at the Father and Son, or does the Holy Spirit not have a face or is the 3rd person left out of the face to face communications?
I did not say "the Father has a literal face." Stop putting words in my mouth as to lead to more ignorance and confusion.