So many pages, so many repeats of the same central topics in any Christian forum.
Really, what's the point? Hashing and rehashing the same doctrinal chestnut isn't going to change the minds of people on either side.
The Trinity is Tri-Theism, not of Christ. Jesus never taught the trinity because as God he knew there was only one. As God said of himself over and over in the OT. Which is the foundation of the NT.
The Triune doctrine has an insertion date into scripture and its hundreds of years after Jesus. That tells us it is a man made fiction.
Let people believe what they're impassioned to believe. Arguing likely only reiterates for them that they're right. Otherwise others wouldn't labor and strive to change their mind.
In the end, we'll all find out what's what. And some of us, likely me too, are going to be very surprised. Meanwhile, you're the Gospel! Your example and to everyone who sees you.
Defend that. Don't worry about others giving their Gospel example. Let them worry about that.