Its much easier than that to estimate, just look at
Saints in our Book, at the three "genuine" popes, combined xp 361927, combined writeups 46224, about 7.83 XP per node
so 74943 * 7.82985029421945 =~ 586792, or about 5.86 times pope, or about 6 popes
FWIW, that is treating all Anonymous Monks as one user that likes to spend all his votes :) OTOH if you count all the saints the average goes up 7116126/540347 = 13.169548456825, but of course this doesn't take into account monk level (: I don't do stats :)
Me personally, I have about 15 thousand posts, which would make me the third pope ahead of corion