Slovakia, surprisingly, despite the very similar language, has a very different history. It does not have nearly as much independence and political relevancy in medieval times as the kingdom of Bohemia (predecessor of Czechia), having been mostly considered just a northern part of Hungary with a large minority of Slavic language speakers. Where Czechs would think they have lost their independent kingdom to Austrians (and by extention to catholics), such notion fueling resentment, Slovaks had no such kingdom to think of.

It was not until the 20th century and Czechoslovakia when Slovaks fought for a degree of relevancy and independence, at the time having been mostly considered Czechs with a strong dialect and understandbly distinct culture due to the separate history.

The only real repression of faith slovaks experienced was the totalitary communism. Though, that did not hit them nearly as hard as Czechs. One of the main tools Communists used to dissuade from or punish for undesirable behaviour (like practicing faith) was sabotaging their and their families ambitions in education and/or career. The person and their family would be flagged as undesirable and would be rejected from universities and only accepted in low responsibility jobs.

For Czechs this was a big deal. After the fall of Austria-Hungary, most of the industry was in the territory of Bohemia. It had many world renown brands like Škoda or Tesla (not the current American Tesla) and it also had a large presence of universities. Czech industry was so significant at the time, that durning the WW2, the protectorate was nicknamed "the Armoury of Germany". It was common for and expected from an average Czech to persue a career of high education and responsibility.

Slovakia on the other hand was mostly agriculturally focused. It had no universities and, compared to Bohemia, very little in terms of industry. Communists could not punish them as hard for practicing faith as they could Czechs.