If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
False, really? So looking at the data in these two links you think you see a statistically significant trend?
Don't forget that your (second) link is concerned with proxies for being an Evangelical...
The margin of sampling error is +- 3% while the difference the 1980 percentage and the 2005 percentage is 5%. I do think that a trend which has a p value less than .05 is statistically significant.