Yeah, you’re going to need to drop some sort of proof beyond whatever that was. The Bible is very clear on the trinity, which is why it’s doctrinal.

Jesus’s baptism: God says this is my Son in whom I’m well pleased. Then the Spirit descended on him like a dove. Genesis 2: Let us make man in OUR image. Jacob wrestled with God, Moses saw God’s backside of his glory, since no one can see his face and live. Jesus claimed he was the son of man, a title for the messiah, which is why the Jews wanted to kill him. Deuteronomy 6: God is ONE.

All this to say… there is but one God, who is three distinct persons making up one God. This is a mystery to our eyes. That does not make it false. God the father, who sent Jesus, God the son, who left us with the Spirit, God the Holy Spirit. A three corded strand is not easily broken.

There is no other God, there is no revelation beyond John’s final revelation, Book of Revelation as spoken by God himself to John.

The doctrine of Mormonism is also very wishy washy. Soda was forbidden until the “white horse savior” mitt Romney was caught drinking one… uh oh, special revelation, soda is okay. Black people weren’t allowed… uh oh, special revelation for them. How many “special revelations” before that cult falls apart?

I’m not justifying the shooting, which is horrible and sad. Double sad because these people had an opportunity living in the USA to hear the true gospel and turn their hearts to God. And maybe some Mormons who are “shallow-faith” Mormons who don’t follow much of the Mormon tradition and are more aligned with Christianity will be saved. Even if God saves them all, I’m not going to be offended.

But we ought to, while here on earth, earnestly seek to follow God's clearest commands that we can understand by what he has given us, including to test everything according to what God has given us (yes, even the BS meter we have plays a role). I believe the reformed theology drives closest to this, because the pinnacle of their faith is the words of the Bible, and disregarding the tradition of man (in spiritual matters). Man is faulted whereas God is not, which is why I agree with that form of thinking.

If a book is found lacking in evidence of being written by an inspired writer (like the book of Thomas) which contains fairy tales (effectively) of 4 year old Jesus making clay birds that fly and there’s no historical evidence of their existence being tied to the alleged writer, why would that book be considered “canon”? So we need to look with weary eyes on all of these things and put them to the test.