Is Christianity functionally polytheistic?

In principle, Christianity is monotheistic. It posits that one god exists. However, as a result of the 300k+ christian sects, there exists more than one definition of the "Christian God". With the existence of multiple *definitions* of a "Christian God" amongst different sects and doctrines this creates a plurality of practices - each aimed at their respective notion of *the* "Christian God". In other words, since these multiple definitions lead to a pluralism of practices, does this mean Christianity **functions** as a polytheistic faith? **If not**, this would require that all 300k sects agree that they worship the same "God".