That’s just silly, and goes to show what passes for political analysis these days. In percentages, the U.S. is by far the most Christian nation on earth; in terms of constitutional government, nobody even HAS one that is similar, and in terms of common law, every year referendums and initiatives testify to the power of common law-—again, something not even present anywhere else in the world.
Regarding America being a majority Christian nation:
From 1972 to 1993, the General Social Survey of the National Opinion Research Center found that Protestants constituted about 63% of the population. This declined to 52% in 2002. Protestants are believed to have slipped to a minority position sometime between 2004 and 2006 for the first time since the year 1776. 1
“Respondents were defined as Protestant if they said they were members of a Protestant denomination, such as Episcopal Church or Southern Baptist Convention. The category included members of the Church of Jesus Christ of Latter-day Saints and members of independent Protestant churches.”
For planning purposes, let’s say that the delta from 2002-2010 is roughly the same as from 1993-2002. My guess is that it’s higher, but let’s say it’s the same. That puts American “Christians” given the above (extremely dilute) definition at 43%.
Although doctrinally they are not Christian, Mormons they stake out the same moral-social positions as do Protestants so let’s leave them in the 43% for now. Although their historic doctrine is Christian, churches like the Episcopal Church, the United Methodist Church, the Presbyterian Church-USA, the “Evangelical” Lutheran Church, and the United Church of Christ have abandoned historic Christianity to varying degrees and are 180 degrees out of step with the moral-social positions of the rest of historic Christianity, so let’s deduct them from the 43%.
43% - 6% (Methodists) - 0.7% (UCC) - 2% (ELCA) - 1.7% (Episcopal) - 0.1% (PCUSA)
That leaves us sitting at 32.5% of the population that can be considered more or less reliably Christian.
I’ve left the 22% of the population that is Catholic out of the equation for now because many American Catholics tend to be like Reform Jews in both their level of spirituality and the moral-social positions they stake out (which puts them at odds not only with the teachings of historic Christianity, but at odds with the Vatican). This is reflected not only in Catholic laity, but with a number of priests and bishops as well.
Even if you were to include every Catholic in America regardless, that would only get you to 54%.
I think that the idea that we are a majority Christian nation really no longer applies...which also goes a long way towards explaining why we see what we see in our society today (from Black Friday tramplings to gay marriage).