the point is that nominal catholics are becoming protestant, because the lack of priests and failure to teach religion (or because they teach liberation theology instead of Jesus) leads to them embracing Jesus when someone from a protestant church leads him to the Lord.
As a Catholic, I see pros and cons: without the protestant conversions, they’d become athiests.
What is the practical difference? Beliving in your own opinions versus believing in nothing?
Outside of the Church there is positively no salvation.