On his knees, head bowed before bloodstained robes, a Polish man was deep in prayer. He was worshiping in a chapel at the John Paul II Center in Krakow, a sprawling complex where relics of the former pontiff are displayed, including the clothes he was wearing when nearly killed by an assassin’s bullet in 1981. An engineer, the man said he preferred to keep his prayers private and asked that only his first name…