If God were part of a trinity, would not his Word, the Bible, clearly and directly tell us so?

When Jesus was baptized, a voice came out of heaven, saying: "You are my Son, the beloved."
If God were truly on earth being baptized, would he project his voice up to heaven and back so that those words could be heard on the earth?
Would that not be misleading?
Would God, "who cannot lie," do such a deceptive thing? - Luke 3:21, 22; Titus 1:1,2.

Bufgimp
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Age is an issue of mind over matter. If you don't mind, it doesn't matter.
Mark Twain