For Orthodox Christians in America, the 20th century was shaped by waves of believers fleeing wars, revolutions and persecution in lands such as Greece, Syria, Russia and Romania.

The Orthodox did everything they could to preserve their faith and cultural traditions. When bishops visited these small flocks, it was rare to see converts.

Then, in the late 1980s, flocks of evangelical Protestants swept into the Antiochian Orthodox church and then the Orthodox Church in America, which has Slavic roots. These converts began reaching out to others. Then came the seeker-friendly Internet. Then came COVID. Suddenly, streams of young families began exploring what was often called the mysterious, ancient "Eastern Church."

"Some observers liken this influx to a flood, and the comparison is accurate. I do not visit a parish without meeting catechumens there. In some parishes, they number more than 100," said Metropolitan Saba, leader of the Antiochian Orthodox Christian Archdiocese of North America, in a recent Denver address.

"While many long-standing believers see in the converts a source of renewal and vitality -- and a spur to discover their own Orthodoxy personally and deeply, not merely as a social religious tradition -- many also feel somewhat threatened by the cultural changes occurring in their parish."

In a survey of his priests, Saba said, one wrote: "The century of the 'church of immigrants' has ended; the century of evangelization has begun. Orthodoxy's mission is no longer primarily geographical … but existential."

Orthodox Christianity remains a small flock in America, with 2-3 million believers in 2,000 parishes. The Pew Research Center has estimated that, globally, there are 260 million Orthodox Christians, the next largest communion after the Catholic Church with 1.4 billion.

The bottom line: The catechumenate class numbers are staggering.