Interesting definitions for "Born Again Christians" and "Evangelicals" taken from the Barna Group Update (Survey Shows How Christians Share Their Faith.
“Born again Christians” were defined in these surveys as people who said they have made “a personal commitment to Jesus Christ that is still important in their life today” and who also indicated they believe that when they die they will go to Heaven because they had confessed their sins and had accepted Jesus Christ as their savior. Respondents were not asked to describe themselves as “born again.” Being classified as “born again” is not dependent upon church or denominational affiliation or involvement.
“Evangelicals” are a subset of born again Christians in Barna surveys. In addition to meeting the born again criteria, evangelicals also meet seven other conditions. Those include saying their faith is very important in their life today; contending that they have a personal responsibility to share their religious beliefs about Christ with non-Christians; stating that Satan exists; maintaining that eternal salvation is possible only through grace, not works; asserting that Jesus Christ lived a sinless life on earth; saying that the Bible is totally accurate in all it teaches; and describing God as the all-knowing, all-powerful, perfect deity who created the universe and still rules it today. Further, respondents were not asked to describe themselves as “evangelical.” Being classified as “evangelical” is not dependent upon any church or denominational affiliation or involvement.
Taken From Barna Group Update, January 31, 2005.