Harsh criticism. But fair if it is true.
But can you show me a single scripture that says Jesus is part of a Trinity?

The word “Trinity” is not in the Bible. The doctrine developed gradually and wasn’t widely believed until hundreds of years after Jesus death. (partly because the Catholic Church hunted down anyone who questioned it as "heretics"after they merged with the Roman Empire who had been the ones persecuting Christians before that)
The Bible teaches something quite different to the Trinity. (1 Corinthians 15:24-28 contradicts it a dozen times- Paul sure didn’t believe Jesus was part of a Trinity)
That is part of the reason why hundreds of thousands in Mexico have quit the Catholic Church and become JW’s. They are seeing things in their own Bibles and realising it is contrary to what their Church teaches.
What are they supposed to do when that happens?
If the JW’s are teaching falsehoods - yes, “a plague.”

But if they are teaching the truth … Then perhaps they are the world wide preaching work Jesus prophesied would happen before the end in Matthew 24:14.
Blessings to you, Logically in the name of our Lord Jesus Christ!!
While the word “Trinity” is not used in the Bible there are many verses that speak to the doctrine of the Trinity. I guess my question to you is, “Do you believe that Scriptures teach that there is One God?” If you do here are a couple of verses that speak to the 3 in 1 doctrine:
Matt. 28:19, “Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit,”
2 Cor. 13:14, “The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all.”
Genesis 1:26, Then God said, “Let
us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.” Who is the US written there?
John 1:1-2 In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God.…
Here is something you may already have read but it goes into a bit more detail about God the Father, God the Son and God the Holy Spirit being the one person.
biblehub.com/john/1-1.htm
John 10:30, I and the Father are one.
My favorite verse John 1:1 In the beginning was the Word and the Word was with God and the Word was God
Here is a simple interesting article discussing the Trinity as well. I hope our scholars in exegesis can help with the discussion of the Trinity as we simply can’t take Scripture out of concept but we use Scripture to interpret Scripture.
God bless, Logically!
Rita