For the stat to be fraudulent it would have to be inaccurate, while its use would be fraudulent if it was presented as if white Christians represented all of Christianity, which the fuller set of data does not do. Since white Christians do show a marked difference on some issues versus other ethnic groups then many other pollsters differentiate the ethnic groups also.
However, how evangelicals;s are defined can differ among pollsters. Here is a Pew report from 2015 .
Fact Tank - Our Lives in Numbers
Compared with other Christian groups, evangelicals’ dropoff is less steep
Unlike some other groups of Christians in the U.S., evangelical Protestants have not declined much as a share of the U.S. population in recent years, according to a major new Pew Research Center study.
Our 2014 Religious Landscape Study finds that since 2007, when a similar survey was conducted, the share of evangelical Protestants has fallen only modestly, from 26.3% of the adult population to 25.4%. By contrast, both Roman Catholics and mainline Protestants have declined by more than three percentage points during the same period.
Looking at the raw numbers, the evangelical population actually appears to have grown slightly over the last seven years, rising from roughly 60 million to about 62 million. Again, this contrasts with mainline Protestants and Catholics, who together have lost several million adherents during the same time period. http://www.pewresearch.org/fact-tank/2015/05/15/compared-with-other-christian-groups-evangelicals-dropoff-is-less-steep/