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I get the impression that an atheist from an Evangelical family will just be an atheist. That's it. They'd never call themselves Evangelicals. But no matter what you believe--- everything, anything or nothing -- the ex-Catholics and ex-Jews will still be there "identifying" as Catholic and Jews and messing up the Catholic and Jewish statistics.

Being Jewish is usually a matter of ethnicity, or race, which one is born as, a Semite, not necessarily faith, whereas a Catholic is a specific religious identity. As for evangelical, last I looked, some surveys classify respondents as evangelical depending on answers to a few basic questions (as Barna), and or what denomination they belong to (which themselves are classified based upon some general and recognized basic defining aspects), but typically they combine “born again” with “evangelical.”

In the 2005 Baylor Religion Survey, 33.6% of the US population were categorized as Evangelical Protestant by affiliation, but in choosing to affirm titles among many labels to describe their religious identity, and in which more than one could apply, 47.2% choose “Bible-believing,” and 28.5% “Born again,” 17.6% and “Theologically Conservative,” but only 14.9% chose the specific term “Evangelical,” and barely 2% say it is the best description.