I have seen no statistics to bear out the assertion that the RC church is thriving, at least in the US. In my city, once the home of a vibrant Catholic community churches and schools have closed, and most of those I know who once attended those schools have drifted away. The local Archdiocese is bankrupt, or nearly so, due to payouts to victims of child abuse, partly owing to an institutional practice of criminal coverups which has been well documented. There is a notable shortage of those entering the priesthood. Meanwhile, it is the megachurch phenomenon that seems to be thriving the most locally, with one huge Baptist, a couple of charismatics, a reformed and at least one Lutheran megachurch. But numbers really don't mean much anyway as a measure of spiritual vitality.