As I understand postmillenialism, it includes the idea that the period of Christianization will end with one last great apostasy.

Even though I am not very familiar with the eschatology debate I know that this is a very basic question (one which will obviously not be new to a Postmillenalist) and you should be able to find some info by looking through old threads in this forum.

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DAVIDIVS DOCTVS VTRIVSQVE LINGVAE
Husband of Emilia
Member: First Reformed Presbyterian Church of Durham (RPCNA) - Durham, NC
Currently in the process of transferring membership to an as-yet-undecided church in Chapel Hill
Student: University of North Carolina at Chapel Hill, German Literature and Classics