An illuminating in - depth exploration of the complexities - and perhaps audacity - of naming the unnameable. One of the oldest and most beloved prayers - known even to Jews who rarely attend synagogue - is Avinu Malkeinu (''Our Father, Our King''), a liturgical staple for the entire High Holy Day period. ''Our Father, Our King'' has resonance also for Christians, whose Lord's Prayer begins ''Our Father.'' Despite its popularity, Avinu Malkeinu causes...