There is no problem as such between nationalism and religious life. Real Trad Cath looks like Franco or Salazar. But it's false when people claim that you HAVE to convert a nation to piety first or that secular don't deserve national life. Hungary, Czech, Japan prove otherwise
The majority of Czechia is non-religious.
Only 12 percent of Hungarian Catholics regularly attend church.
The orthodox countries are also pretty nationalist and conservative but have very low church attendance rates.