Angels (or Bigfoot, heaven, or miracles) are “real” to you if you accept that they are, but has no bearing on whether they really exist or not. Whatever the actual reality, it is not determined by our belief in something. Belief is a brand of hope, not knowledge. Knowledge is based on what we can show; evidence.
Therefore, without specific proof, we cannot truly know, so what is “real” to us is a construct of our criteria of truth.