Nor are the two congregations merging.
Rather, members of both churches are calling their new relationship a partnership.
"We have become Colerain Church, a member of the Wesley Neighborhood," said Dr. Lewis Shoemaker, chairman of Colerain Baptist's board of advisors.
Members of Colerain had been looking for a way to boost their dwindling attendance and even assuring the congregation's survival.
"We had low attendance in the fall and we were worried about financial problems. It was looking likely we weren't going to last a year if we didn't do something," Dr. Shoemaker said. "We had 43 members and an average Sunday attendance in the low 30s." Colerain Baptist is debt free, he added.
The opportunity arose as Wesley was considering ways it could reach out to smaller congregations.
"We have a mission for churches that can be revitalized," said R. Blake Deibler, Wesley's senior pastor. "There are wonderful churches around with wonderful people but they're struggling. But we had to decide how to do this without appearing to be arrogant. We weren't thinking about Colerain Baptist, but all the pieces fit together."
The partnership became official when Wesley's members voted overwhelmingly on Sunday, June 3, to approve the relationship. Colerain's members had voted to approve the relationship last month.
Even before the votes were taken, Wesley began providing the Sunday services' pastor and music for Colerain. By September, Colerain Church will have its own permanent pastor.
The fit is a good one, Dr. Shoemaker said.
"We talked about how we match up so well," he said. "We laid out our constitution and Wesley's and we could have switched them. That's another sign that this is a good match. … We're a much smaller congregation, but we will have the advantage of the opportunities available to a larger congregation. But we will keep the intimacy of a smaller congregation."
Wesley's membership now stands at about 400 with Sunday attendance averaging 600.
The partnership follows by less than a year of Wesley's birthing of a La Consequa, a Spanish language congregation.
That congregation had been meeting in Wesley's main sanctuary. The congregation moved into the old Wesley sanctuary, where it held its first service on October 1, 2017.
"This may be the first of a number of partnerships in the next five years," Deibler said of the partnership with Colerain Church.
All of Colerain's assets, including the sanctuary and cemetery, will be transferred to Wesley. A transition team will be working to make the partnership go as seamlessly as possible.
"We view this as a way of getting the gospel out to the community," Dr. Shoemaker said.
"It will not just be like another Wesley here. We will have our own flavor."