While gathering in large groups is certainly unwise when it comes to a virus easily spread in large numbers, doing so to pray to God (or at least a god) to eradicate disease seems way more realistic than telling a virus, "Hey hey, ho ho, Covid-19 has got to go!" Also, I'm gonna go out on a limb here and assume that many of the people there don't have church online like western countries seem to be doing (my church included).
Just my 2 cents