The term evangelical comes from the word "evangel" which is a word form in Greek from the New Testament that refers to the good news of Jesus Christ -- that Jesus came to save humanity -- and evangelicals have a particular take on the good news. That makes them distinctive from other Christians. It could be summarized, I think, with four cardinal beliefs that evangelicals tend to hold, at least officially.
One belief is that the Bible is inerrant. It was without error in all of its claims about the nature of the world and the nature of God. A second belief is that the only way to salvation is through belief in Jesus Christ. A third belief, and one that is most well known, is the idea that individuals must accept salvation for themselves. They must become converted. Sometimes that's referred to as a born-again experience, sometimes a little different language. Then the fourth cardinal belief of evangelicals is the need to proselytize, or in their case, to spread the evangel, to evangelize.
Now different members of the evangelical community have slightly different takes on those four cardinal beliefs. But what distinguishes the evangelicals from other Protestants and other Christians is these four central beliefs that set them apart.
Fake news

about flagpoles and "screw that pope guy" notwithstanding, there are evangelicals within all Christian traditions. Even in the Roman church.
And I agree with Guin. 'iggins is a hidiot.
Romans 13:1-2
Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God. Consequently, whoever rebels against the authority is rebelling against what God has instituted, and those who do so will bring judgment on themselves.
And yes, I know full well that some interpret Paul as an apologist for the Roman empire. And yes, I know that when authority is contrary to God (e.g. A Hilter in North Minehead), it is a Christian duty to resist. But the civil authority here is not defying God but is doing its rightful job in caring for every neighbor.
For Christianity, by identifying truth with faith, must teach-and, properly understood, does teach-that any interference with the truth is immoral. A Christian with faith has nothing to fear from the facts