(Credit: Evan Zimmerman / Met Opera) The Metropolitan Opera is set to present John Adams’ acclaimed opera-oratorio “El Niño.” The work will be staged by Lileana Blain-Cruz, a resident director at Lincoln Center Theater. Conductor Marin Alsop will make her Met debut leading cast that includes soprano Julia Bullock, bass-baritone Davóne Tines, mezzo-sopranos J’Nai Bridges and Daniela Mack, countertenors Key’mon W. Murrah, {…}