The poorest fifth of Alabama families, with incomes under $13,000, pay state and local taxes that take almost 11 cents out of each dollar. The richest 1 percent, who make $229,000 or more, pay less than 4 cents out of each dollar they earn, according to Citizens for Tax Justice, an advocacy group whose numbers are generally considered trustworthy even by many of its opponents.

Image Prof. Susan Pace Hamill says 18 states, especially Alabama, seriously violate biblical principles in the way they tax and spend. Credit... Gary Tramontina for The New York Times

Professor Hamill said what first drew her to the issue of fiscal policy and biblical principles was learning that Alabama timber companies, which own more than two-thirds of the land in the state, pay an annual property tax of only about 75 cents an acre.

“The Bible commands that the law promote justice because human beings are not good enough to promote justice individually on their own,” she said. “To assume that voluntary charity will raise enough revenues to meet this standard is to deny the sin of greed.”

Richard Teather, who teaches tax at Bournemouth University in Britain and has written on the moral dimensions of tax evasion, said that governments have publicly raised the issue of morals and taxes.

“The tax authorities say you have a moral duty to pay your taxes, but you cannot look at that in isolation,” Mr. Teather said. “Over here in Britain we have a lot of tax breaks for the very wealthy, which are not generally available to most people, and quite high level taxes for the middle and upper-middle classes, so this doesn’t look like a moral system.”

Professor Hamill, by her reading of the New Testament, concludes that at least a mildly progressive tax system is required so that the rich make some sacrifice for the poor. She cites the statement by Jesus that “unto whomsoever much is given, of him shall be much required, and to whom men have committed much, of him they will ask the more.”

Some of her critics, however, say that the tithes described in the Old Testament show that a flat tax, in which everyone pays the same share of their income to government, should be seen as the biblical standard.