When they set out to find growing mainline churches, sociologist David Haskell and historian Kevin Flatt did the logical thing -- they asked leaders of four key Canadian denominations to list their successful congregations.

It didn't take long, however, to spot a major problem as the researchers contacted these Anglican, United Church, Presbyterian and Evangelical Lutheran parishes.

"Few, if any, of the congregations these denomination's leaders named were actually growing," said Haskell, who teaches at Wilfrid Laurier University in Branford, Ontario. "A few had experienced a little bit of growth in one or two years in the past, but for the most part they were holding steady, at best, or actually in steady declines."

To find thriving congregations in these historic denominations, Haskell and Flatt, who teaches at Redeemer University College in Hamilton, had to hunt on their own. By word of mouth, they followed tips from pastors and lay leaders to other growing mainline churches.

The bottom line: The faith proclaimed in growing churches was more orthodox -- especially on matters of salvation, biblical authority and the supernatural -- than in typical mainline congregations. These churches were thriving on the doctrinal fringes of shrinking institutions.

"The people running these old, established denominations didn't actually know much about their own growing churches," said Haskell, reached by telephone. "Either that or they didn't want to admit which churches were growing."

The researchers stated their conclusions in the title -- "Theology Matters" -- of a peer-reviewed article in the current Review of Religious Research. In all, they plan five academic papers build on their studies of clergy and laypeople in nine growing and 13 declining congregations in southern Ontario, a region Haskell called church friendly, in the context of modern Canada.