I, all my siblings, the majority of my cousins, graduated from Catholic high schools. How many of us, and how many of our classmates, are serious Catholics? And how many total strangers, who went to completely different Catholic high schools in completely different decades–even on completely different continents–tell largely the same tale?

Yes, data is not the plural of anecdote–but sometimes the anecdotes pile up so high, it becomes rather implausible that the data is going to tell a substantially different story.