I too have had those thoughts. My journey just began in November so Q was already silent, but from everything Ive seen thus far I can only come to two conclusions on how Q knew and predicted the future so accurately, (1) quantum time travel or (2) God... my guesses are absolutely mind blowing to me, but its the only two possibilites I can come up with...

3) Screenplay. Enjoy the show. Since the war was already won when Q started posting, writing the script wouldn't have been as difficult as it seems. But yes, God is the ultimate creator of this. People just learning his sense of humor the hard way imho.