Isto é quase certamente O Caminho da Cruz e do Dragão por George RR Martin .
"The Way of Cross and Dragon" is set in the same fictional "Thousand Worlds" universe as several of Martin's other works, including Dying of the Light, Sandkings, Nightflyers, A Song for Lya, "With Morning Comes Mistfall" and the stories collected in Tuf Voyaging. It involves a far-future priest of the One True Interstellar Catholic Church of Earth and the Thousand Worlds (with similarities to the Roman Catholic hierarchy) investigating a sect that reveres Judas Iscariot.