Poor Shavuot — it’s not very high on the priority list of Jewish holidays. Unlike Passover, there is no boisterous family seder to attend. You are not obliged to eat matzo, Charoset or bitter herbs.

Secularism is on the rise. Between 2012 and 2014 alone, some 7.5 million Americans lost their religious faith. And a great many of them are parents — or will be someday. So how do we, as ...