If Christianity Disappeared, Would It Ever Make a Comeback?

What would happen if everyone forgot everything we ever knew and we lost all our books and everything with information on it and we had to start from scratch? Would Christianity be lost forever? Atheists say that it would be lost but, as Christians, we believe that it would always make a comeback. How you answer this question says a lot about what you already believe, but it doesn't do anything to PROVE what you already believe. Using this hypothetical (that is, made up) situation won't work as an argument for what you believe because it's just circular reasoning!