Easy to find out, ask what groups they support and consider themselves part of then look at the atrocities of the groups, funny how Christians cry persecution for standards that should be applied equally.
Two words, I know they are kind of big so read them slowly.
READING COMPREHENSION.
Sir_Simon_Spamalot was clearly implying that by mugmoor's "logic" they also give implied to support to some organization that has committed an atrocity at some point.
Do you eat food from a store? I bet that store carries Nestle products. Those stores help Nestle put money in their pockets. Nearly every grocery store and therefore food shopper must therefore "implicitly support" those atrocities.
In fact, it implies a stronger support, since OPs church definitely does not send money to the catholic church which mugmoor was actually talking about.