The Trinity is a profound mystery. This does not make it illogical. Mysteries transcend human reason without contradicting it. A finite human mind cannot fully comprehend the infinite. 

Believers do not “lie” about understanding it and to say so is to miss the point—accepting a mystery does not require total comprehension.

But in any event, there have been centuries of theological reflection by some of the greatest minds in history who saw the Trinity as the best explanation of God’s self-revelation.

The theology introduced by Joseph Smith, on the other hand, including the rejection of the Trinity, is a radical departure from historic Christianity. His conception of God as a finite, exalted man and the belief in multiple gods is not rooted in the Bible or the early Church but in 19th-century innovation. 

By contrast, the Trinity is firmly anchored in the biblical witness and affirmed by nearly all branches of historic Christianity—Catholic, Orthodox and Protestant.

The prayer in Gethsemane reflects Jesus’ human nature in perfect communion with the Father. The distinction between the persons of the Trinity is not a denial of their unity. Jesus can pray to the Father and there still be one God, just as a person can speak to their own mind—distinct in role yet united as one being.