I believe Calvin ( a major influence on the theology of most Baptist sects) was comfortatable with the term ‘Theotokos’, as translated “God-Bearer”, but NOT with the term “Mother of God”, for the reasons just outlined. Calvin in particular and Protestants generally reject any notion of Nestorianism. To allege otherswise is to establish a straw man. More accurately, I think this is the “this is that” fallacy. In any case, it is an unfair depiction of what historic, Reformational Protestants and the majority of their sister denominations actually aver in their confessions, creeds, articles of faith, and other doctrinal works. If one does not wish to be insulted as a crypto-pagan, one might want to temper one’s attribution to Protestants of heresies they do NOT accept. Your hands are full enough refuting the ones they clearly DO accept.