If we restrict usage of "God," addressed as a Person, to the Father, I can see how there would be a problem referring to God the anything. When we pray to the Son or the Holy Spirit, we use more words than just "God," as far as I can remember. But, then again, St. Gregory the Theologian says, "When I say God, I mean Father, Son, and Holy Spirit." I can see how modalists can use God the..., but I still don't see how the very use thereof implies modalism. Heresy is lodged not just or only in the word, but in the understanding and meaning.
Anyway, for Slavs, I don't see how this has any meaning since Slavic languages, at least Russian and Ukrainian, (and Georgian, for that matter as well, though it's not Slavic) do not employ articles.