Atheists say there isn't a God, Religions say there is a God.
Agnostics say they don't know.
I don't know. And I mean that in a profound sense.
Most people are uncomfortable not knowing and so choose one of the two paths above. I am comfortable not knowing so don't need to choose a path.
I don't know if I have a body. My consciousness appears to be locked inside my skull along with my Brain.
My Brain has no knowledge of the outside world beyond that which is receives sensory inputs (touch, smell, sight, hearing etc..). I don't know if those sensory inputs are real or imagined.