It's a reality melt down that Christians have used for millenia, and may be part reason for the decline of Christianity today - less people got the time for that nonsense these days.
God has a permanent and powerful church on earth today and all days. This "church" is not a single organization and not dependent on it's size. It's there and it's just as powerful as ever. Our frail/weak human minds often equate church numbers with a decline, but the exact opposite is true. Your carnal mind does the same.
Quote
Matthew 16:17-19 ESV
17 And Jesus answered him, “Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven. 18 And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it.