Yes you do belong to a denomination. Your denomination was created by you, and you are a man/woman. You are also a sinner like the rest of us and share our fallen (corrupt) nature. So in reality, you belong to your own denomination that you created from your personal bible interpretations. Therefore you most certainly do belong to a man made religion where you alone hold doctrinal authority and the corrupt body politic is consists entirely of you.

I've been there. It eventually gets real lonely my friend.