Now, I admit, I don't know any ENFps personally, but I figure that they work on the same level as INFjs. My INFj friend ignores my objections to his beliefs about aliens and dragons...

Your friend's beliefs sound more like those most would more readily associate with ENFjs. The idea that ENFps and INFjs work on the same level sounds really ridiculous as well. Or perhaps "level" should be clarified.