The Archangels are real, but it's also a matter of personal belief in their existence. So you should ask your self, "Do I believe the Archangels are real?" When answering just be truthful about it. If you're not sure then just meditate on it.
Take for instance the Lesser Banishing Ritual of the Pentagram (LBRP) It incorporates four Archangels: Raphael, Gabriel, Michael, and Auriel. It would be a good thong to have the belief in the Archangels when doing said ritual. But I'm sure you can do it with little to no belief in them or without them. Just replace the four with other entities you feel comfortable with if without. (This serves as merely an example)
The point is it all boils back down to what you believe in. So figure out what you believe in. No one can tell you what you believe.