Check out USA Today's Graphic of the data collected over 20 years from the American Religious Identification Survey.  It compares changes in religious affiliation for Catholics, "Other Christians," "Other Religions," "Not Religious," and "Don't Know."  The changes for "not religious" were particularly interesting, even for down here in the South.  Christianity is still prominent, but the last 20 years signal a definite shifting in the cultural landscape.

I smell a mission field.

Pastor Craig