What is an Evangelical Christian?
Americans struggle to define the term "evangelical Christian" according to a  study by Ellison Research. Here are the categories of how Americans define "evangelical Christian." Many responses had multiple themes and fit multiple categories. For this reason, the response categories add up to more than 100%

No idea 36%
They evangelize 18%
A type of Christian 9%
Zealous/devoted 9%
Rely on the Bible 8%
Theology 8%
Worldview/politics 6%
Fanatics 5%
Assorted criticisms 4%
Closed-minded 4%
Greedy 3%
Impose their beliefs 3%
Flashy 2%
Theology definition (wrong) 2%
Professional ministers 2%
They follow Christ 1%
Activities 1%

Source: Ellison Research, September 2008