OK; this leads to some interesting philosophical considerations, quite apart from the problem of establishing precisely what God does or doesn't say.
It tells us that truth is arbitrarily dependent on God's word, and so bears no necessary relation to our human experience and perception of reality, nor to logic or maths. Truth is simply the word of God. If God says it is right for Abraham to kill his son, then that is true. If He changes His mind, it is no longer true. You may say that God wouldn't contradict the analytic truths of logic and maths, and that might be the case (maybe you can know the mind of God to this extent, I don't know what the theologians say about this), but the synthetic truths of everyday life, and the broad moral and ethical compasses of culture, society, and individuals, are all susceptible to contradiction by this arbitrary truth-by-fiat.
But the tricky problem is in establishing the word of God, because this too is culturally dependent, and can lead to a confusing contradiction of God-given truths. Even among Christians, there are many different versions of the the word of God, so differing versions of the truth, producing schisms that have develop into different sects.
As I understand it, in principle, the word of God to Christians is a truth of tolerance and compassion (not that you'd always notice in practice, but that's what the monks of St. Benedict taught me). For certain other cultures, the word of God is a very different truth - that of intolerance and lack of compassion for those that don't have their specific beliefs. These we might call fundamentalist groups or cults.
Ask the believers of each of these religions, sects, groups, schools, & cults, "What do you believe?" and they may say, "We believe the truth". Ask them, "What is the truth?" and they'll probably say, "It's the word of God". Ask them what the word of God is, and they'll say, "It is the truth, it is what we believe". Outside this circularity, ask them where they find the word of God, and they'll point to some human artefact, or a human, or their own selves. Often the artefactual sources are the same, or very similar, but the word of God is read differently in them by each group, to a greater or lesser extent.
That's the way it looks from here - so who can explain which word of God really is the truth, without the circular argument that it's what they believe?