What they saw was worshippers singing hymns and waving palm fronds as they marched in Palm Sunday processions at these churches. Similar sights will be common during Holy Week rites this week and then on Easter Sunday.

There is nothing unusual about various churches celebrating these holy days in their own ways. What is rare is for the churches of the East and West to be celebrating Easter (“Pascha” in the East) on the same day. This will happen again next year, as well as in 2014 and 2017.

This remains one of the most painful symbols of division in global Christianity. While Easter is the most important day on the Christian calendar, millions of Christians celebrate this feast on different days because they have — for centuries — used different calendars. The Orthodox follow the ancient Julian calendar when observing Pascha, while others use the Gregorian calendar introduced in 1582, during the reign of Pope Gregory XIII.

“It was a calendar issue then and it’s a calendar issue now,” said Antonios Kireopoulos, an Orthodox theologian who is a leader in interfaith relations work at the National Council of Churches of Christ. “This is about calendars, but it’s much more than that.”

This clash between liturgical calendars in the East and West, he said, also affects how churches pursue their missions. “We are talking about the central event of our faith, yet we remain so divided about it. … That has to raise questions for those outside the faith. If the resurrection is so important, why can’t we find a way to celebrate this together?”

Seizing the temporary unity represented by the shared Easter dates this year and next, Kireopoulos and National Council of Churches General Secretary Michael Kinnamon recently renewed an earlier call that challenged leaders on both sides to pursue a permanent solution to this clash of the calendars.

Their letter restates three recommendations from the 1997 Aleppo Conference, which was hosted by the Syrian Orthodox Church of Antioch. That gathering called for Christians worldwide to:

* Honor the first ecumenical council of Nicea by celebrating Easter on the first Sunday following the first full moon after the spring equinox, which would maintain the biblical ties between the Jewish Passover, Holy Week and Easter.

* Agree to calculate astronomical data by using the best available scientific methods, which was a principle established in Nicea to settle an early controversy about the date of Easter.

* Use the meridian line for Jerusalem as the reference point for all calculations, once again honoring the biblical narratives about the death and resurrection of Jesus.

The problem, of course, is that making a change of this magnitude would require a broad spectrum of Christian leaders — including the pope and numerous Orthodox patriarchs — to agree on something that stirs deep emotions among the faithful. Orthodox leaders continue to wrestle with splits linked to a 1923 decision to celebrate Christmas according to the Gregorian calendar.

The final Aleppo document recognized that it would be especially hard for Eastern believers to change their traditions.

“In some countries in the Middle East and Eastern Europe, where the Christian churches have lived with the challenge of other religions or materialistic ideologies, loyalty to the ‘old calendar’ has been a symbol of the churches’ desire to maintain their integrity and their freedom from the hostile forces of this world,” it said. “Clearly in such situations implementation of any change in the calculation of Easter/Pascha will have to proceed carefully and with great pastoral sensitivity.”

Orthodox leaders know that the Easter gap will keep getting wider — with Pascha creeping into the summer in about a century.

But change is hard. As old joke says, “How many Orthodox Christians does it take to change a light bulb?” The answer: “Change? What is this ‘change’?”

“This is not a matter of one side finally giving in and the other winning,” stressed Kireopoulos. “This is a matter of finding a way to proclaim — together — what we all believe about the resurrection of Jesus Christ. … What we hope is that, once again, we can follow the principles of Nicea and find a way to move forward.”

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The leaders of this famous megachurch outside Chicago can be precise about this number because that is how many people had, at mid-week, visited WillowCreek.org and claimed seats in the 7,200-seat auditorium. A few solo seats remained.

“We don’t sell the tickets, of course,” said spokesperson Cally Parkinson. “Most people really like the E-Tickets. It’s convenient to know that you’ll have a seat and it helps us prepare for all of those people in the church and the parking lots.”

These 75-minute Christmas services began on Tuesday night and continued through the popular Christmas Eve triple-feature at 12:30, 3 and 5:30 p.m. This is, as Parkinson likes to say, the Super Bowl for this “seeker friendly” congregation.

Any way you look at it, 55,000 people is a big Christmas. Willow Creek’s leaders are used to that. They are not, however, used to handling a barrage of questions — primarily from journalists — about their decision not to hold a Christmas service on Christmas Sunday.

Many other big congregations decided to use the same strategy, which meant the “Churches Shut Doors on Christmas” headlines spread nationwide. The timing was perfect, in a year when the “Put Christ back in Christmas” debates were bigger and louder than ever in the public square.

“I think the whole Christmas wars story was being driven by TV talk shows and politics and we just turned into the next day’s story,” said Mark Ashton, who serves as “pastor of spiritual development” at Willow Creek. “Ironically, when all is said and done, this could turn into the biggest outreach event that we’ve ever done as a church.”

Willow Creek has, as a rule, never held services on Christmas Day, he explained. The exception came in 1994, which was the last time Christmas fell on a Sunday. After hosting the usual throngs in the pre-Christmas services, hardly anyone — which at Willow Creek means 1,000-plus people — returned that Christmas Sunday. This is serious, since it takes 1,000-plus people to operate the children’s ministries, youth groups, food services, bookstore operations and parking lots when the megachurch opens its doors on an ordinary Sunday.

Thus, Willow Creek’s leaders decided to create a 12-minute DVD this year containing a story — entitled “Emmanuel: God With Us” — about a young woman in Chicago struggling to understand the meaning of Christmas. The church produced 25,000 of the DVDs for home use by families on Sunday.

“We don’t think that we’re skipping worship on that Christmas Sunday,” said Ashton. “What we’re doing is decentralizing it. … We’re hoping to end up with 20,000 mini-services in homes in the Chicago area and all across America.”

The goal, for Willow Creek leaders, is finding a way to create the most “spiritual experiences” for the most people this Christmas, he said. It helps that most megachurches are not tied to the ancient traditions that steer other flocks.

In a statement released to critics, Willow Creek leaders explained that in their community, the “normal Christmas rhythm is to celebrate Christmas with a Christmas Eve church service, then spend Christmas Day with family and friends. Most nondenominational churches reflect this same pattern. Some liturgical churches, like the Episcopal or Catholic churches, are tied closely to a church calendar. They always celebrate Christmas Day as a high point on their calendar. So if they departed from this tradition, it would be a big change.”

In other words, Willow Creek remained true to its own goals and its own philosophy as a church. Keeping the doors closed on Christmas Day was not a change in a worship tradition — it was an expression of a modern reality.

“Our goal is to serve people in ways that make the most sense and have the most spiritual impact on their lives,” said Ashton. “It’s not just a matter of giving people what they want. It isn’t just consumerism. We challenge the socks off people with the messages they hear while they’re in our services. …

“But we also notice how people vote with their feet. We notice when they want to attend services and when they do not. We take that into account.”

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