In the Gospel of John, “God” is never the Trinity. For instance, in one of the most well known verses of the Bible, whose reference is written out on posters at football games:

John 3:16 “For God so loved the world, that he gave his only begotten son, that whoever believes in him should not perish but have eternal life.”

Try substituting “God” in this verse with “the Trinity”.

“For the Trinity so loved the world, that he gave his only begotten son…”

It doesn’t make sense.

-

Many Christians think that the Gospel of John is the main New Testament book where Jesus is proclaimed as God, and that God is then somehow a Trinity. However, in not one occurrence of the 83 occurrences of the word "God" in the Gospel of John is God a Trinity.

-

Rather, in the Gospel of John, the only true God, Jesus's God and our God, is the Father.

https://landandbible.blogspot.com/2019/10/did-trinity-so-love-world-in-gospel-of.html