<diacritize> Both Calvinist and Catholic clergy mounted fierce opposition against the group , but Socinian ministers took advantage of the atmosphere of religious tolerance , promoted by such Polish kings as Sigismund II Augustus and Stephen Bathory , to teach their ideas . <yor>Both Calvinist and Catholic clergy mounted fierce opposition against the group , but Socinian ministers took advantage of the atmosphere of religious tolerance , promoted by such Polish kings as Sigismund II Augustus and Stephen Báthory , to teach their ideas . 