No, God is not a Trinity

For there is one God, and one mediator also between God and men, the man Christ Jesus, who gave Himself as a ransom for all, the testimony given at the proper time. (1Ti 2:5-6)

God cannot be a Trinity because Jesus, the Son, is always subordinate to the Father, who is God.

"You heard that I said to you, 'I go away, and I will come to you.' If you loved Me, you would have rejoiced because I go to the Father, for the Father is greater than I.” (Joh 14:28)

This is a very clear example of Yeshua (Jesus) being lesser than His Father (Yahweh), and it just makes sense. Most people who say they believe in the Trinity actually believe this, too. When it comes down to it, they don’t actually believe in the Trinity at all, but think they do because the word is rather ambiguous and it’s a requirement for baptism in 99.9% of churches. One must say they are Trinitarian to be members in the club.

There’s a reason the doctrine of the Trinity is ambiguous. It was created to allow a whole lot of people with varying beliefs about the relationship between Yahweh and Yeshua to claim to believe the same doctrine. This is the net result here 1700 years later. Two people sitting in pews in the same church who say they are Trinitarian don’t believe the Trinity the same. The shocking truth is the Trinity doctrine is actually a political dogma built to solve a political problem. Disputes about the nature of Yeshua and His relationship to Yahweh created full blown physical conflicts back in the third and early fourth centuries. Doctrine wars were literally wars. You can’t have a universal church (Catholic really means universal) when people are openly disagreeing to the point of violence. So they came up with a doctrine that satiated almost everyone. And those who refused to believe, well, at a minimum they got disfellowshipped. A minimum.
This message can be found in print at https://firstcenturychristianity.net/god-is-not-a-trinity/