Clarence Darrow believed in them as useful tools for selecting jurors. Deliberations quotes, and links, 1936 Esquire article.
If a Presbyterian enters the jury box and carefully rolls up his umbrella, and calmly and critically sits down, let him go. He is cold as the grave; he knows right from wrong, although he seldom finds anything right. He believes in John Calvin and eternal punishment. Get rid of him with the fewest possible words before he contaminates the others; unless you and your clients are Presbyterians you probably are a bad lot, and even though you may be a Presbyterian, your client most likely is guilty.
If possible, the Baptists are more hopeless than the Presbyterians. They, too, are apt to think that the real home of all outsiders is Sheol, and you do not want them on the jury, and the sooner they leave the better. The Methodists are worth considering; they are nearer the soil. Their religious emotions can be transmuted into love and charity. They are not half bad; even though they will not take a drink, they really do not need it so much as some of their competitors for the seat next to the throne. If chance sets you down between a Methodist and a Baptist, you will move toward the Methodist to keep warm.
Beware of the Lutherans, especially the Scandinavians; they are almost always sure to convict. Either a Lutheran or Scandinavian is unsafe, but if both in one, plead your client guilty and go down the docket. He learns about sinning and punishing from the preacher, and dares not doubt. A person who disobeys must be sent to hell; he has God’s word for that.
As to Unitarians, Universalists, Congregationalists, Jews and other agnostics, don’t ask them too many questions; keep them anyhow, especially Jews and agnostics. It is best to inspect a Unitarian, or a Universalist, or a Congregationalist with some care, for they may be prohibitionists; but never the Jews and the real agnostics.
Hat tip to Walter Olson.