no, that is not right at al..
Yes, before the Swedish invasion protestants were quite numerous, including major Polish and Lithuanian noblemen, and widely tolerated.
Later on Jesuits converted a lot of Poles
In addition during so called Swedish Deluge Polish protestants (at least many of prominent protestants like Radziwils or Jan Amos Komensky) supported Swedish aggressor what had dramatical consequences for traditional tolerance in Polish-Lithuanian Commonwealth.
the above are the right answers.. besides the consequences of the swedish deluge the counter reformation was strong in PL and from what i read, mainly because of heavy Jesuit involvement.
PL-Lith commonwealth is mentioned numerous times.