What the hell are you talking about?

Why bring God into this? Totally unrelated and irrelevant.
We're talking about the odds of Nadal ending in Djoko's quarter given the seeds of each (and assuming no rigging of the draw) and the odds of Nadal potentially meeting Djokovic in the quarter finals are 25%. It's just basic maths.
By the way, we were not addressing Rafa being in Djoko's half or not, but we were talking about the odds of Rafa being in Djoko's quarter. Playing Djokovic in the semi-final is not the same as playing him in the quarter-final.