What do Evangelicals tell themselves are the difference between them and Neo-Nazis? I'm curious.

First show me an evangelical and then show me a neo-nazi and then we can discuss it.

I think the first five words of your question disqualifies most rational discourse. IMHO. 

You  evidently aren't acquainted with the definition of Evangelical.I might also add that you show little understanding of the Judeo-Christian foundation of this country, or the the history of same, or even world events as we see them unfolding daily. Do your homework(a little grammar wouldn't hurt either) and come back later.

not sure what they tell themselves

Did someone forget to use the "Reply" button? I can't tell who is being insulted!