Revelation 18:9-11 adds to the description of a nation, not a church, as it describes a huge, worldwide merchandising and manufacturing entity that men weep over when destroyed. Religious entities do not manufacture and merchandise. This is vital to understand because Revelation 18 must coordinate with the identity of the Woman in Revelation 17. Thus, Revelation 18, describing what nations involve themselves in, provides another major reason why the Woman cannot be a church.
The Woman of Revelation 17-18 may be religious, but she is far more interested in what produces power and influence in this world. Remember, Israel rejected God, becoming a nation of this world (I Samuel 8). In Revelation 18, the emphasis is on her financial aspects, as the merchants, manufacturers, and shippers of products bewail her destruction, seeing their wealth going up in smoke. No church is manufacturing and merchandising as chapter 18 describes.
The Woman's wealth is a major foundation of her power, enabling her to influence so readily; her economic power adds strength to its other worldly powers. Follow the money, verses 9-11 urge. They clearly portray globalization and all the outsourcing it implies. The Woman is depicted as a huge, worldwide merchandising powerhouse that has promoted the spread of industry all over the world so she might consume what others have manufactured through their craft.