Of course Atheists limit their basis to this physical world. Name some other world that is accessible that we can examine and shed new light on the issue. Speculation and conjecture don't count. It is also worthless to consider anecdotal evidence as it cannot be confirmed. To accept something offered as evidence we must be able to reach a consensus and that is not possible if only the person experiencing the phenomena has access to it. Just because a thing can be imagined doesn't mean it's true, or even possible.
:homo: Well put..