If God is inscrutable, why did he make humans without the ability to comprehend him and/or the problem of evil?
Is it a design flaw? That makes him less than omnipotent.
Could he have designed us differently but chose not to? That makes him rather a jerk (i.e., not perfectly loving).
Among the things that we don't understand is, presumably, the reason why God made us in such a way that we don't understand. Is this compatible with goodness? Frankly it is hard to see how. But once again, that is precisely the point. Given that we don't know everything, is it impossible? I don't think we can say it is impossible that God has good reasons that we don't know.
If we encounter a maths problem we can't understand we might say, "I can't work out the answer to this".
It may be that there is no answer to the maths problem. It may be meaningless for all we know. Or it may have an answer, but we simply don't know what the answer is.
What would make no sense would be to say: "I can't work out the answer to this maths problem, therefore there is no answer to this maths problem".