At least 125 churches from various denominations are in conversation with ARC leaders about joining.

"Realistically, it's a large group of conservative churches that are also providing a lot of income to the denomination. I really think the mass exodus of all these conservative churches is going to throw the RCA into a really difficult financial situation," said Steven Rodriguez, an RCA church planter in Brockport, New York. "I doubt the RCA will be financially sustainable for much longer."

The move follows the RCA General Synod's October decision to adopt measures for "grace-filled separation" with departing churches and to appoint a team to develop a restructuring plan for those that remain.

The new denomination, besides not affirming same-sex marriage or ordination of LGBTQ individuals, will have a strong emphasis on church planting and feature a flexible organizational model meant to foster theological alignment and efficient decision-making, according to ARC leaders.

"We have a passion for this remnant of believers to become a part of reformation and revival in the Northern Hemisphere," said Tim Vink, the new denomination's director of spiritual leadership and outreach. "Part of our strategic thinking is designing things for the 21st century that allows a multiplication of gospel-saturated churches and a multiplication of disciples."

Other conservative-leaning churches in the RCA, as well as those in the Presbyterian Church in Canada, Christian Reformed Church in North America and Presbyterian Church in America, are also discerning whether to join the ARC, according to Vink.

Other groups, such as the Kingdom Network, a group of five churches in Indiana and Illinois, have formed and expect to absorb conservative churches leaving the RCA.

Vink said the new alignment will promote growth. "We want to be a safe landing pad for churches in the near term, but in the long term, want to be a serious launching pad for the church, in mission, to the world," he said.

The launch of ARC is part of a larger realignment within North American Protestantism. The last two decades have seen conservative Episcopalians, Presbyterians and Lutherans form their own denominations over LGBTQ inclusion and sexuality, and the United Methodists are scheduled to consider a denominational split in the fall.

A theologically and politically diverse denomination that dates to the arrival of Dutch settlers in Manhattan in the 1620s, the RCA has been debating sexuality and LGBTQ inclusion since the 1970s. In 2018, the RCA's General Synod formed a team charged with discerning whether the RCA should stay together, restructure or separate. The team ultimately suggested a path involving all three avenues, but the meeting to vote on the team's proposals was delayed for 16 months due to the COVID-19 pandemic.

In the interim, roughly 15 congregational, regional and strategic leaders from the RCA began meeting virtually to consider a future outside the denomination. Part of that future, they believed, involved theological unity on the interpretation of Scripture.

"We believe if the church is going to be successful in the 21st century, it needs to be powered by a more agile structure and it needs to be more theologically aligned than theologically diverse," said Dan Ackerman, ARC's director of organizational leadership.

Joel Baar, an ARC board member and elder at Fellowship Reformed Church in Hudsonville, Michigan, which opted to join ARC by a vote of 604-9, said that theological conformity of ARC is part of what appealed to his congregation.

"As the RCA was attempting to define and clarify marriage," said Barr, "and efforts had been happening over the decades in that regard, there continued to be this tension within the RCA of whether or not the Bible was the full authority of God's Word. We started feeling at Fellowship we no longer belonged within the RCA."

But theological differences remain even within the new denomination. While the understanding of marriage as between a man and a woman is a "top tier" theological belief, Ackerman explained, the question of women's ordination is a "second tier issue" that local leaders can address in their own contexts.

Every five years the organization and individual congregations will assess how well they are serving one another and if they should remain partners in ministry, said Ackerman. "The word 'alliance' implies a choosing that happens so you can accomplish a certain thing, and then you reevaluate and say, is that alliance still helpful for the next chapter?"

ARC will replace national in-person conferences with video calls, digital messaging platforms and other forms of virtual communication to make decisions more efficiently, organizers said. Its board already meets twice a month to expedite response times.

The creation of ARC, paired with the RCA's decisions at General Synod, has put many RCA congregations in the position of deciding whether to stay in the RCA.

Baar says the decision to leave the RCA wasn't a simple one. "My roots in the RCA are deep," he said, saying part of his congregants' discernment about leaving the denomination was "a grieving process."

Faith Reformed Church in Zeeland, Michigan, also took time to discern its relationship to the RCA. For now, the congregation has decided to remain in the RCA. But staying isn't easy either.

"We mourn some of the people who are no longer part of the denomination. There are churches we planted that will leave, there's children we've raised up in the church that are pastors of churches that are leaving," said the senior pastor, Jonathan Elgersma. "We do feel there has to be space to lament."

RCA leadership has reached out to its congregations, hoping to sell them on RCA's increasing diversity and new international church-planting and missional partnerships, which includes its 375-year-old Global Mission organization that supports roughly 100 missionaries and partners through its $8.5 million worth of endowments.

Yet the RCA is also committed to allowing departing churches to leave on good terms. "We want to bless our brothers and sisters who are choosing to find another denominational family," said Christina Tazelaar, director of communication for the RCA.

The ARC seems equally dedicated to a smooth transition, and ARC pastors say they are open to the idea of continued partnerships with the RCA. "We bless the RCA, we pray for the RCA," said Vink.

Elgersma, too, is hopeful that the ARC and RCA will remain in conversation. "Are we faithful enough to respect the full kingdom and listen to and learn from each other?" he said. "I really hope that's where we land as this plays itself out."

But, said Vink, "the General Synod in October made it clear to many conservative churches that the time is now to look for a new wineskin."

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