If Christianity is a society - some version of the late-Roman, or Medieval European, of Calvin's Geneva/ Knox's Scotland, or Eastern Orthodox, or Brigham Young's Deseret... That is; if Christianity is a union of Church and State in spiritual harmony - then Christianity is long since gone, and finished.
Also; if Christianity is a structure of authority; with a church defining the nature of what Christianity is, what scripture means, what theological concepts are true and mandatory, what traditions are valid and necessary... with Christians being the people who obey what that church says - then Christianity is finished.
Also; even if Christianity is just a group of people of some significantly powerful size - all agreeing and acting-upon what Christianity is - then Christianity is already finished.
Indeed: if Christianity is some ideal future situation or state which we should be working-towards, and for which we need to wait before we can be a really-real Christian - then Christianity is finished.
Unless you or I can be a real and full Christian here-and-now, starting with ourselves as we are, in this situation; and not depending upon any other people or authority to instruct, validate, or cooperate-with us - then there is, and shall be, no Christianity.
And unless we acknowledge this independence, and therefore take total and personal responsibility for ourselves Being Christian Now - then sooner or later we will Not be a Christian.
(Whatever we decide to call ourselves.)