Notice that God is calling out of Babylon those He calls “My people.” Jesus has His people, from all walks of life, within many religions and denominations including Roman Catholicism, that He is calling out.
The glory that fills the earth is the radiant light of God’s character of love. Therefore Revelation 18:1 is just a repeat of the first of the 3 angel’s messages found in Revelation 14:6-7, which is the “everlasting Gospel.”
We are now, presently living under the influence of the global system of End-Time Babylon. And while we may quickly, in a worship setting, claim loyalty to Christ and His Kingdom, what really has our loyalty and allegiance?