This is incorrect. There is an ongoing debate in theological circles over this. One side is that of "classical theists" (e.g., Feser, Hart) who argue that traditionally, God is not a being, personal or otherwise, rather He is Being itself. The other side, who can be called "personalistic theists" (eg Plantinga) say God is the Supreme Being, which is to say, a being. This is largely a modern debate, in that the classical view (as indicated by ts name) was predominate until modern times.
The classical theists, by the way, do maintain that God is personal (thus justifying referring to him as Him), but only in the sense that God is described with characteristics that we assign to persons, such as Intellect, Will, Love, and so on. (It should also be noted that for classical theists these characteristics are, as Peter mentioned, not separable, by the Doctrine of Divine Simplicity. That is, God is Being is Intellect is Love is Will, not a being that has an intellect, loving disposition, etc.)
So given all that, Bernardo's Mind-At-Large is very close to the classical theist's view of God. Where it is likely to differ is in how the relation between God/M@L and creatures is understood.