The concept of the trinity defined by the Nicene Creed is vastly elaborated compared to the verses in the New Testament that refer to it. At the same time, there are several instances where the trinitarian view of God is nonsensical, such as when the Father announces His acceptance of Jesus' baptism, or the numerous times Jesus stated that He was "returning" to "His Father". How would a single being return to Himself? Why would He engage in ventriloquism at the scene of His baptism?
Regardless, we both believe in Jesus Christ, even if we believe in different things about Him. We are therefore both Christians.
The doctrine is pretty unchanging. You sound like you have a misunderstanding of what is "doctrine" and what is not. I have no interest in convincing you of anything, but I will address some of what you have stated just so other people do not get the wrong idea. Much of what you have stated is incorrect.
The November 2015 policy change was never prophecy. It was never characterized as prophecy. It was always merely policy.
Temple ceremonies have never been directly from God. From the very beginning, the first time they were introduced in Nauvoo.
Nope. The everlasting covenant was about our doctrine of eternal marriage in general; polygamy was only included as far as it involved a sealing in the temple. The words describing this are the same as they were when Joseph Smith wrote them in 1843.
Incorrect. The Church makes a clear distinction between its policies and its doctrine. See here: https://www.churchofjesuschrist.org/study/liahona/2021/12/come-follow-me/why-does-church-policy-sometimes-change?lang=eng#title1
What, do you think missionaries go around baptizing people at gunpoint? I'm no longer a full-time proselytizing missionary, but even when I was, forcing people to join the Church against their will was never a part of the program. What I'm doing right now is being a missionary, by rebutting the misinformation you are posting. Since you've clearly got no interest in coming back, all I can hope is that you will find peace in your heart and stop spreading misinformation about us.