Sentence:  The tide of <WSD>holidayism</WSD> which came into Christianity with the Sunday has never been checked, even temporarily, by any other authority. Divine authority alone can make a Sabbath; whatever is less than that, cannot rise above <WSD>holidayism</WSD>. 
Meaning of the word marked with <WSD> tags:  The tendency to treat the Sabbath as a day off rather than a solemn religious occasion.