Strictly speaking, no, but I'm pretty sure everyone is able to understand the point of differenciating an evidence that can be reproduced and detected by external means, and one which is happening entirely inside one's mind.
I mean, we could go on a large tangent about the philosophical aspects of Matrix and the like, but we're ALREADY making large détour compared to the initial point (which was that "atheism is not a religious belief, it's the absence of religious belief"), so I'm not really willing to bother with this one on top of that, especially as we all know, as said, the difference.
Actually I repeatedly said "not acceptable as a hard proof".