Well, you sold me on that a majority of Protestants don't agree with me on predestination, :) but most Protestants don't accept OSAS either? EVERYONE in my SB church believes in at least that. Are you saying that most Protestants have a Roman Catholic view of salvation? What do you say that most Protestants believe about salvation?
One of the difficulties I have encountered on this thread is that most people don't get out of their own denomination and so don't have a clear view of what others believe. There are Catholics, Orthodox, and Protestants on this thread who didn't know that most Protestants believe in free will, but not in predestination (at least in the classic Reformed sense.) But then most Catholics do believe in predestination, but not exactly in the Calvinist sense. St Augustine believed in it, and I think that is where the belief comes from for Catholics. And St Augustine had an influence on some of the Protestant Reformers.
Do the majority of Protestants believe in OSAS? I would say no, that grace can be lost without a renewal of the will. But if you are asking for precise Aristotelian definitions and categories, I don't have any to offer you.
Are you saying that most Protestants have a Roman Catholic view of salvation?
If it corresponded exactly, Protestants would stop being Protestants and become Catholics. But there is a great deal of overlap in beliefs if you are willing to overlook things like church polity, vestments and the order of worship.