Reporters who are truly interested in the future of the American faith-scene need to know this number — 100. Or maybe it’s 85 or 90. I’ve heard others say the crucial number is 115 in expensive zip codes.

But the late Lyle Schaller, a legendary church-management guru in oldline Protestant circles, once told me that it took about 100 actively contributors to fund the salary-and-benefits package for a credentialed minister in a mainline church. When Schaller said “mainline,” he was talking about the “Seven Sisters.” In descending order by size, that’s the United Methodist Church, the Evangelical Lutheran Church in America, the Presbyterian Church (U.S.A.), the Episcopal Church, the American Baptist Churches USA, the United Church of Christ and the Christian Church (Disciples of Christ).

In other words, if a church had more than 100 active members (or households) it could provide for its minister and then do other things — like keep the building from falling down. With fewer than 100 members, a church would be constantly struggling with basic expenses, trying to keep the doors open.

So that’s the statistic that looms over that glowing New York Times feature about a lively Presbyterian Church (U.S.A.) congregation on Manhattan’s Upper West Side that represents the future of the religious left. The dramatic main headline states: “The Church Where Believing in God Isn’t Strictly Necessary.”

Yes, I hear what many readers are thinking. This is a church that even the New York Times can love. And how many people are in these pews? Readers will have to read way down into the story to find that information. Meanwhile, the summary lede contains a few details:

Observant Presbyterians are always part of gatherings at Rutgers Presbyterian Church. But much of the time, so are Roman Catholics and Jews, as well as a smattering of people who consider themselves vaguely spiritual. Valerie Oltarsh-McCarthy, who sat among the congregation listening to a Sunday sermon on the perils of genetically modified vegetables, is, in fact, an atheist.

You have to love that detail about the “perils of genetically modified vegetables.” However, the thesis statement comes a few paragraphs later, as the editorial angels sing a song of hope for a future free of nasty stuff like ancient doctrines:

Typically, the connective tissue of any congregation is an embrace of a shared faith.

Yet Rutgers, a relatively small church on the Upper West Side of Manhattan, has rejected that. Sharing a belief in God — any God at all — isn’t necessary.