20-30 % will say they are catholic if you ask but you would never guess it from their behavior
A typical of that group would be Ferdynand Kiepski from the TV sitcom "Świat według Kiepskich" who pompuosly anounces to his wife from time to time: - "Ja jezdem Polak, ja jezdem katolik!" (the audience laughs) trying to illustrate the very well known cliché "Polak-katolik".
This legislation is about enforcing a certain vision of what a Catholic country should be
This vision seems to be much broader than a "Catholic country" alone. This point is developed deeper in an interview with Karol Modzelewski to the POLITYKA weekly:
Karol Modzelewski was a well-known dissident in the communist times (it was him who invented the name "Solidarity" for this famous labour movement in 1980) and also is a well-know historian of medieval times (his fascinating book "Barbarzyńska Europa" on the barbarian Europe was translated into English as well as into French, German and several other languages). In the interview he argues that the opposition makes a mistake talking to the public of a possible "authoritarian state" under the PiS rule because these are words of foreign origin which most of the public would not comprehend. - What words should the opposition use here then ? - asks the journalist. - This is simple; they should talk of the "police" state [in the future] instead - says Modzelewski and evokes the case of the 22-year-old Igor Stachowiak who had been mistaken for a drug dealer by police and died as a result of the detention at a police station in Wrocław. Afterwards the authorities tried to sweep the true reasons leading to his death under the carpet for more than year until the time when a footage leaked from the police station to the hands of a journalist and was shown on TVN24.
(This most appaling case is desribed here pl.wikipedia.org/wiki/%C5%9Amier%C4%87_Igora_Stachowiaka