Are you suggesting that Catholics and Episcopalians reject the compatibility of evolution with faith?
Not at all. You asked “Do you not agree that Catholics and Episcopalians, who are fine with the allegory concept, are Christians?”
I’m not quite as familiar with Episcopal doctrine as I am with Catholic, so I limited my answer. My answer was that I do not agree with your statement, and it has nothing to do with Genesis. It is possible believe Genesis is allegory (or whatever) and be saved; it’s not possible to believe all that Rome teaches and be saved.