Folks that claim to be reformed should subscribe to one of the reformed confessions - Baptist Confession of Faith, Westminster Confession, Belgic Confession, Second Helvetic, Canons of Dort, etc.
Evangelical has become so broad as to be almost meaningless at this point. A few weeks ago, I would have said that it covered anyone who has professed faith in Christ as his or her savior, but a recent survey indicates that perhaps some who ought not be considered Christian flock under that banner. “While 48 percent of all evangelicals surveyed think only born-again Christians will go to heaven, 45 percent said they do not believe that.” http://pewforum.org/news/display.php?NewsID=3267
IOW, a sizable number of evangelicals are not Christians. As I read this, 52-55% of those saying they are evangelical do not believe you must be born again, ie., have total Faith in Christ Alone, in order to go to heaven. It seems the appropriate response is to ask them if they are Christians and what does that mean.