I think you nailed it. All the other so-called Christian denominations are like wild mushrooms sprouting around the giant mustard tree, this wild growth fertilized by low-intellect followers soon withers and die, not unlike the neighborhood Foursquare Church with their self-ordained and televangelical pastors from Rev. Joel Osteen to Rev. Jim Jones to Rev. Schuller, to Rev. Wright and to Rev. Jesse Jackson and beyond.
We don't need masonry, red and purple gowns, statues, etc., to learn the Word of God. All we need is the Word itself.
It is nearly the end of this age and we will be there at the end (we certainly will not have withered), and a few of us will not be fooled by antiChrist. We'll see who is easily fooled and who isn't. Are Catholics ready for the antiChrist? Will any Catholics be able to resist him? I'll bet of those Christians that resist antiChrist, many more will be of the kind like me who study with a bible and a few friends rather than those who are in some big congregation in a building decked out in pretty colors.