Once again, the rooster crowed is, to this day, considered Karlheinz Deschner's most important book by many. The meticulous work has given countless people the feeling that their doubts about Christianity are justified. Deschner demonstrates that the very foundations of the Christian faith are questionable, and that the subsequent "Criminal History of Christianity" almost logically follows from this. The subject of the work, first published in 1962, primarily focuses on the Early Church. It examines the early conflicts, the emergence of the hierarchical apparatus, the treatment of dissenters within its own ranks, and the interactions with competing religions of salvation. The continuities in the politics of the popes—"representatives" of Christ, after all—extend all the way into the 20th century.