Why do you think it was not necessary for it? To me it is the discovery vs. invention problem. With theism truths are made by discovery, truth is the information that is closest to the priomordial information of the thoughts of the creator, the primordial blueprint. Without theism, truths are simply models, tools, handy little gadgets used for prediction and invented, not discovered.
There's a tradition which focuses on God being unknowable, so I think people who believed that could think that human maps are not the territory.
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