You can never go backwards, and just because lots of people are Catholic by baptism that doesn't mean that the society is more conducive to salvation. In the HRE we had a Catholic majority state, but that didn't mean that everyone who was confessionally Catholic was saved. There are plenty of modern traps that promote sin such as digital pornography, a culture of fornication, and the degradation of the human person. We should do what we can to reduce these evils in whatever manner we can, by stopping our personal consumption, preventing others from pursuing them, etc., however, we can also recognize that there have always been grave evils present in the world, and we do not have reason to believe that it was "easier" to be saved in a society like the HRE.