Why do you think God is responsible for men's "canon" lists?
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Well, It's really kinda simple when you take the time to think about it.
We all agree the Bible was inspired by God, he had different people write what He wanted written, at different times throughout history, while under the influence of the Holy Spirit.
With that being understood, why then is it such a stretch to believe, that God again would insure His Inspired Word to mankind was preserved in such a fashion as He wanted it to be.
The 1st. Council of Nicaea was convened in 325 AD. but a decision on what books would be included in the Canon was not undertaken until 381 AD. that's 56 years later, they had a lot of time to consider which books would be looked at for inclusion, but far beyond that, God would again Inspire these men to include into the Canon, those Books that He (God) wanted included.
To say man is incompetent and could / should not be trusted with such a thing is understandable.
But at that point you are disallowing God to Have His Will followed, again through the Inspiration of the Holy Spirit.
Remember, God used a Donkey, and would use even the rocks if need be, so what would make you believe He could not use a bunch of unruly humans to accomplish what He wanted accomplished.
God isn't going to leave such a monumental thing up to the whim of man.
It's Gods Word to us, His fingerprints are allover it.
I think it would be best understood, "It's by Faith"