Depends how you define real. If you use real as in reality, then it depends. Subjectively it can't be as religion is a belief is based on what you imagine to be true. Reality in its truest form is an objective definition on what is unavoidably true based in imperical evidence. Reality in that form exist, but claiming a religion to coincide with it in its truest form is like throwing your dart blindfolded at the dartboard believing you hit the bullseye, though you won't be able to take off your blindfold. So, your religion might be real/truth, and it might not be. So believing defines your subjective take on what might be reality, it doesn't have to be equal to reality in its objective take. So there might be and there might not be real religion at the same time, Schroedingers cat.