The Trinity doctrine is questionable because of people like you that claim the Bible teaches that doctrine (as opposed to supporting it) despite all evidence to the contrary.
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Does the Bible Support the Idea of the Trinity?
While the word Trinity is not found in the Bible, is the concept of the Trinity taught clearly in it?
The Encyclopedia of Religion Vol. 15 1987 admits: 'Theologians today are in agreement that the Hebrew Bible does not contain a doctrine of the Trinity.'
The New Catholic Encyclopedia: 'The doctrine of the Holy Trinity is not taught in the Old Testament.'
The Encyclopedia of Religion says: 'Theologians agree that the New Testament also does not contain an explicit doctrine of the Trinity.'
The Encyclopedia Britannica 1976 observes: Neither the word Trinity nor the explicit doctrine appears in the New Testament.'
Protestant theologian Karl Barth (as quoted in The New International Dictionary of New Testament Theology 1976) similarly states: 'The New Testament does not contain the developed doctrine of the Trinity. The Bible lacks the express declaration the Father, the Son, and the Holy Spirit are of equal essence.'
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God knows what His attributes are.
The only one of the three you listed that God said about Himself is being Almighty.
That makes the rest questionable.
The truth is the truth, whether you or I accept it or whether you or I reject it.
Like your rejection of the truth that the Bible does not teach the Trinity doctrine will not change the fact that it does not.
If the Trinity doctrine is the truth, then it is the truth whether the Bible teaches it or not.