God of Confusion
This is an argument I have heard from time to time and their are a few things wrong with it. It stems from the belief that if you can't understand something, that thing that you cannot understand has the problem, and not themselves. It's this type of reasoning how cults are created. God is not the problem, it's the human.
When someone claims that the Trinity doctrine makes the God of the Bible the God of confusion, they are forgetting some presuppositions. One for the very definitions of the God of the Bible is that He is incomprehensible and His ways are not mans ways (Duet 29:29, 1 Cor 2:11; Isaiah 55:8, Job 36:26). So the argument, "I can't comprehend the God of the Trinity!" isn't an argument at all...it logically follows from the attributes of God set forth in Scripture.
Another very important piece of information is that if a human being could comprehend the Creator god, than that God is limited and finite. Finite creatures can only comprehend the finite. God is infinite.