Revelation 18 is not describing a church, but a city/nation involved in massive, worldwide merchandising, shipping, and manufacturing. It is a prophetic picture of globalism. What church has sufficient economic power that, when it ceases to exist, worldwide trade quickly comes to a grinding halt, throwing hardheaded businessmen into a panic? Except possibly as an investor, the Catholic Church has never been involved in manufacturing. Revelation 18 provides no information whatsoever tying the Woman riding the Beast to religion.