I disagree with Dr. Dunning here (Ray and I have talked about this). I think he is still reading the OT through a lens heavily tinted by later western philosophical categories. Such a reading neglects the cultural context of the Ancient Near East in which both corporate identity and metaphorical language (mytho-poetic imagery) are primary intellectual constructs. Thus, for example, the "three men" in
Genesis 18 morphs in the narrative into "the Lord," and the messenger of God talking to Gideon becomes the Lord speaking (
Jud 6:12-16). Or plural pronouns can be used in referring to God (
Gen 1:26, 11:7,
Isa 6:8, etc.) invoking the imagery of a high king surrounded by a heavenly court (as in
Job 1:6 ff or
1 Kings 22:19-22,
Psa 82:1, etc.).
I would contend that in light of these aspects, the OT is strictly monotheistic. All of the OT is processed through the experience of the exile. That left the Israelites fiercely monotheistic. So even when there are remnants of older mytho-poetic imagery or instances of corporate identity, those aspects are placed within an overarching theological framework that is unwaveringly and unambiguously monotheistic.
Of course that does not mean that all Israelites actually practiced such monotheism, as both the
torah and the prophets often remind us. But it is there as one of the baseline theological confessions of the OT (
Deut 6:4). That is precisely what necessitates the logical conclusion of the Doctrine of the Trinity.
Grace and Peace,
Dennis B.