A new study shows a significant decline in the number of Americans who identify as Protestants:
The decline is particularly strong among younger people.
Interesting report. It bears reading all of the way through - not all of the "nones" are atheists or agnostics.
You are absolutely correct, but I do believe it shows a weakening of the religious tradition. Probably the last step in a transformation from believer to unbeliever is declaring yourself and atheist or agnostic. In between there is a lot of "not-very-religious-at-all" expression.
It does show that religion is declining - a good sign.