Should Atheism proper include scepticism?

[theVOID]

Haha, smooth.
a)
How about this: Amongst the billions and billions of things which happen, every one is subject to cause and effect and if we can't identify either cause or effect, there is still something lingering which will lead us to that.

There are many events in quantum mechanics that appear to be non-causal but are rather entirely probabilistic and spontaneous, acting independently of external influence. A good example of this is the radioactive decay of a nucleus, or the change of a photon being reflected on a surface compared to it passing through - all of these things have no known cause, which is certainly not to suggest that it doesn't exist, but it does require the concession that we just do not know whether an truly uncaused event is possible or not.

b)
The argument for "god's" existence also claims by necessity that the state of nothingness is a possibility. For time to exist three parameters of: Space; Objects; and Motion need to be present. The notion that "god" who is invisible, who lives somewhere imaginary or non-physical removes the possibility of any objects in motion. This imaginary land of "god" can only exist within the mind, "god's" place of origin.

I don't quite think the belief is god exists in a state of nothingness, that of course would immediately rule him out of existence as nothingness is a paradox, so i'm pretty sure you are misrepresenting their argument here and because of that the rest of your argument would be invalid, but i'll wait and see what the theists have to say in response, i'm not good at defending their position.