Throughout history, people have held beliefs and convictions that later proved to be wrong: the Earth was not flat, the sun did not orbit the Earth, the world was not created 6,000 years ago, and witches and gnomes did not exist. The Germans were not a superior race, and sins did not cause cancer.
What if your convictions and beliefs also turn out to be wrong? What if also your ideas about God and how life must be lived are delusions? What if your firm conviction that spirituality is pure nonsense is simply small-mindedness? What if there actually is a God somewhere, but all religions have it completely wrong? What if human authorities created the religions to make you obey them?
You're aware of only a small part of yourself and a tiny, tiny part of the world.