Sentence:  A century ago , Newman saw that liberalism ( what we now might call secularism ) would gradually but definitely make its <WSD>mark</WSD> on English Protestantism , and that even high Anglicanism would someday no longer be a `` serviceable breakwater against doctrinal errors more fundamental than its own '' . 
Meaning of the word marked with <WSD> tags:  the impression created by doing something unusual or extraordinary that people notice and remember