Two British plays that came out this past week in New York address the question of whether—and if so, how—faith and reason can be blended. “Grace”, which opened Monday and stars actress Lynn Redgrave, is about the struggle between a mother and son—embodying science and religion respectively (though in the debates between Grace, an atheist and professor of natural science, and Tom, a lawyer who wants to become an Episcopal priest, it is Tom who is, ironically, the voice of reason). "Two Thousand Years," which opened last Thursday and features Natasha Lyonne, covers similar ground within a secular Jewish family, whose eldest son decides to abandon the liberal worldview of his parents and to embrace Orthodox Judaism, becoming devoutly religious. —Kaitlin Shimer