From 2016: a year in closing:
Site Name QuestionsAsked Closed PctClosed DuplicatesClosed DuplicatesReopened OTClosed OTReopened UnclearClosed UnclearReopened TooBroadClosed TooBroadReopened OpinionBasedClosed OpinionBasedReopened
-------------------------------------------------------- ------- --------- ---------------- ------------------ -------- ---------- ------------- --------------- -------------- ---------------- ------------------ --------------------
Christianity 2324 1755 75.52 % 139 5 443 26 265 6 284 19 624 28
Biblical Hermeneutics 1268 415 32.73 % 76 1 217 25 66 5 20 2 36 3
Buddhism 936 69 7.37 % 22 2 24 4 8 4 5 3 10 2
Hinduism 2203 508 23.06 % 260 11 126 17 45 5 26 3 51 9
Islam 2210 424 19.19 % 101 0 100 0 118 2 35 0 70 0
Jewish Life and Learning 4095 1146 27.99 % 413 27 374 30 239 42 74 12 46 3
Philosophy 2697 943 34.96 % 55 2 421 26 242 16 119 10 106 3
Politics 1747 554 31.71 % 63 3 105 6 107 9 88 3 191 17
Skeptics 1670 748 44.79 % 102 7 388 56 157 61 24 6 77 13
As you can see, 75% of all questions are closed. This is far higher than any other site, including the other religious and political sites (which, like this site, presumably attracts trolls, rants, misguided attempts at preaching, etc.)
Why is this number so high?