Back in the heady church-growth days of the 1980s and 1990s, researchers John and Sylvia Ronsvalle began hearing caution creep into their interviews with church leaders.

Denominational leaders were especially uncomfortable when asked about declines in giving to overseas missions and projects to help the poor.

Sylvia Ronsvalle said the leader of one large congregation gave this blunt response: "Ah! No! We can't promote missions because there won't be enough for our seminaries." She responded: "Well, I think people would be more interested in your seminaries if you were actually impacting global needs in Jesus' name."

That encounter, and many others, ended up in "Behind the Stained Glass Windows: Money Dynamics in the Church," one of many publications the Ronsvalles have produced while leading empty tomb, inc. Their center also serves as a hub for missions in Champaign, Illinois, their home for 50 years.

Danger signs began decades ago. Giving to religious groups -- defined in terms of potential donations based on after-tax incomes -- peaked in 1960 and then began to decline, even as church membership numbers and budgets kept rising.

This trend "pre-dated many of the controversial issues that were to emerge by the end of the 1960s," noted the 31st annual empty tomb report, based on 2019 numbers. In mainline and evangelical denominations "per member giving in current dollars, as well as in inflation-adjusted dollars and as a portion of income" was lower in 2019 than the year before.

Then COVID-19 hit. But the pandemic's impact in pews only made an ongoing charity funding crisis more obvious, said Sylvia Ronsvalle, in a telephone interview.

Membership and worship attendance numbers plummeted in recent decades in mainline churches and are now declining or plateaued in many evangelical groups. Meanwhile, marriage and birth rates keep falling, while the number of religiously unaffiliated Americans -- the so-called "Nones" -- keeps rising.

The result is a survival mindset in which religious leaders focus on the "bottom line," leading to fewer efforts to support mission work of all kinds.