Trinity is a doctrine that is quite unique within the Christian faith. No religion is quite risky enough to portray its divine as “one god existing in multiple (in the case of Christianity, three) persons”. Yet, I think this alone can be an argument to believe the doctrine of the Trinity. No human mind can ever think of God as triune. The mind has no capacity to imagine such being because this characteristic has no reference to any human reality. In order for a human mind to know such being, it must be revealed from her. The Trinity is, therefore, a revelation of God and not just a doctrine made up by the human mind. So the incomprehensibleness of this doctrine is not a disadvantage but an advantage.