Interesting concept. Are you alluding to the common "pagan" practice of worshiping one, superior god for whom they would declare war for (Monotheism)? The idea being, "my god is better than yours."
The conceptual roots of pagan monotheism/henotheism probably lie with Platonistic thought (with Stoic universalism as a reinforcing paradigm), as well as the long-lived tradition of cultural relativism in terms of religion (equally met in e.g. Herodotus and Tacitus), which envisioned every nation worshiping the same powers under different names (the so-called 'interpretatio Romana'). Combined, these two modalities would have made it quite easy for Late Antique pagans to co-opt the exclusive monotheism of Jewish and Christian apologists - simply disagreeing on their rhetoric and claim for being the sole retainers of the divine favour. The grammarian Maximus of Madauros (a pagan henotheist or monotheist), in a debate against Augustine, seems quite typical: "Yet who would be so foolish, so touched in the head, as to deny there is one supreme god, without beginning, without natural offspring, like a great and powerful father? His powers, scattered throughout the material world, we call upon under various names, since (of course) none of us knows his true name." (Aug. Ep. 16.1) - Maximus' notion, as well as the Platonic roots of pagan monotheism, are examined more fully in Pagan Monotheism in Late Antiquity by Athanassiadi & Frede (OUP, 1999). Robin Lane Fox's Pagans and Christians, 190-97 also contains a good introduction to the mentalities in question.
EDIT: Hm, there is also a rather striking oracular response from Apollo, 3rd or 4th century if memory serves, which would illustrate this pagan henotheism well. I'll try to dig it up.
ADD: Yes, haha, it was actually in Lane Fox p. 169, though it has also seen much more study since. From Oenoanda, re-used block of masonry close to the altar to Theos Hypsistos (The God Most High). Seems like an answer to the oracular question "What is God?" or "Are you God?". In translation, the verse goes: "Self-born, untaught, motherless, unshakeable / Giving place to no name, many-named, dwelling in fire, / Such is God: we are a portion of God, his angels. / This, then, to the questioners about God's nature / the god replied, calling him all-seeing Ether: to him, then, look / and pray at dawn, looking out to the east." The interesting thing is that this response is quoted also in Lactantius' Divine Institutes 1.7.1-3, with the alleged provenance from Apollo's oracle at Claros. Lactantius, a Christian, naturally uses this as a proof that even the pagan gods admit to being just angels (or, as he argues, demons) acting under a supreme god. A good indication that basically the shared ideology between pagan and Christian thinkers was largely interchangeable, though contested.
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