After one trip into Libya as a migrant worker, Tawadros Youssef Tawadros reported that he had been warned that his Christian name -- "Theodore," in English -- might anger Muslim radicals.

His widow, Maleka Ayad, recalled him saying: "Anyone who starts changing his name will end up changing his faith."

Malak Ibrahim Seniut was more blunt, in a final talk with his priest. Told that Christians could be witnesses by living a long, faithful life, the young man replied: "That's not enough for me. I want to do it through death."

On Feb. 15, 2015, both were among the men beheaded by Islamic State soldiers on a beach in Libya. All 21 -- 20 Egyptian Copts and a Ghanan who professed his Christian faith -- were soon declared martyrs by the Coptic Orthodox Church. This is the latest chapter in a long drama, detailed by writer Martin Mosebach, of the German Academy of Arts.

"The Coptic Church, founded by St. Mark the Evangelist, is among the earliest manifestations of Christianity. In 1,400 years of suppression after the Islamic conquest, it has still preserved its original form and it has proven to have the most amazing vitality," he said, at an event this week in New York City, marking the release of the English edition of his book, "The 21: A Journey into the Land of Coptic Martyrs."

"The faith found in this church was and is stronger than all of the economic and social disadvantages Christians have to suffer. The Coptic Church has never been broken by political oppression. The Christianity of the first millennium is still to be found there and is … a living reality."

After immersing himself in the village culture surrounding these new saints, the Catholic author reached this conclusion: For these men, liturgy and martyrdom were "two sides of one and the same coin."

There was something truly iconic about those 21 men in orange jumpsuits kneeling on that beach, said Coptic Archbishop Angaelos of London.