There was this forum I visited, where a Sikh fellow had made a similar comment. And an atheist asked him" Why call God truth? Truth is something different. Why muddle things up by saying that?" something like that. I ask you that same question.
Okey dokey, lets have some fun with this, and let me bounce ideas.
Rational explanation for the existence of god:
Let us make the supposition that an individual not only believes in the existance of truth but also believes that god is infinite truth, yet continues to, what appears to be redundantly, to affiliate his reality with that of a infinitely describable entity, god.
Now through Descartes Law of Universal Causation we know that all beliefs are born through an agency by which effect is produced; which means, that even the birth of redundancies have cause.
But upon closer inspection, even god is not a redundancy.
So, God is, through the miracle of linguistics, a rational discription and understanding of truth.
We cannot categorize unknown truths (yet to be truths) in the same breath as known truths. We have the existence of known truths and justified true beliefs. But where is new information coming from? (what feeds and asists the ever expantion of knowledge itself). For the internalist new information is just that what is not realized within the mind, for the externalist new information has not been sensed. This new information (literally the unknown) that has not been retrieved, interpreted and realized is also god.
So God is a universal all encompassing concept of truth, whose linguistic equivalent in this case, does not exist.
God is both realized and unrealized truths.
Of co{censored}, now psychological reasons can be drawn out, because if god is both existing and yet to be existing truth, then the pursuit for god is a rational choice, that gives life meaning and may expand the cause for expansion of imagination. …we can also involve discussion of free will but... lets start with this.