Indeed. According to [1], it would appear 58% of the US officially believes in angels by creed (Protestant, Catholic, Mormon, Orthodox, Jewish, or Muslim). Only 11% are atheist or agnostic, and there's a 30% group that's religious but "unaffiliated" or "other". I totally buy that two thirds of "religious but unaffiliated or other" would believe in angels.
The difference here is that to the religious mind, angels are credible in a way that UFOs, ghosts, and magic are not. (The irreligious mind probably finds them all equally credible, hence the disconnect.)
Put another way, it would not surprise me that someone who was "religious but not affiliated" might have a high regard for the Bible. Angels figure prominently in the Bible, and hence fall in that bucket.
