God could reveal all truth to us, yet He has not. As a Theist, you have to believe God has a reason for withholding this.

This same reason is why God incarnate did not reveal all truth.
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Christ gives us an answer to why He withholds truth from us (Mat 13:11-17 & John 10:40).

The answer Christ gives is essentially that He withholds truth from us because we turn away from truth. It is a consequence of sin to be corrected in the next life.
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God also allows ignorance for the same reason He allows other evils:

1) So that grace may abound.
2) To allow the space for philosophers, doctors, etc., which can only exist given evil exists.

Christ wasn’t a great philosopher in part because He wished us to be. 3/3