I'm asking for any atheist to tell me how he KNOWS that ALL reality in existence should be available for our 5 senses to discover through science. He cannot. He BELIEVES this.
Well, this atheist
doesn't believe that.
But any reality that isn't avaliable to those senses simply isn't knowable. There are no methods for the aquisition of knowledge about reality, besides science, that are distinguishable from just making things up.
Can science tell us everything about reality? No. But it's the only thing that can really tell us anything about reality. If it can't be discovered through science it simply isn't knowable.