I have no way of knowing if that's a lot. how often do churches typically burn down?
/*googles it*/
Looks like it's in the low thousands per year with 1/4th typically due to arson (
http://nfa.usfa.dhs.gov/downloads/pdf/statistics/v2i7-508.pdf). 1300 (church fires) / 52 (weeks in a year) = 25 (expected church fires in a week) with a little over 6 expected to be due to arson
There are about 70,000 'black' churches in the country (
http://answers.google.com/answers/threadview?id=96516), about 300,000 churches total (
http://hirr.hartsem.edu/research/fastfacts/fast_facts.html), so about 23% of churches are black (I would expect that to be higher in the south because of the demographics there) so you would expect in any given week a little less that 6 black churches to burn with 1.4 of them to be arsons. So ok I guess it's a little high, 1.6 more arsons than I would expect, but I don't see it as being too far outside the norm, it's hard to tell without doing a more thorough analysis to get the standard deviation which I'm too sleepy to do right now.
But hasn't there been enough racial hysteria and violence whipped up this year? Race relations are the worse I think I've ever seen them. We must have undone 30 years of progress since 2010.