Yeah you can with enough knowledge. And Atheist lack the knowledge foundation to support their claim there is no God. At the most they can claim they do not know.
The concept of ‘proof’ isn’t really relevant in this case since Science doesn’t work on proofs it works on evidence.
No you can’t. It’s a basic rule of logic that there’s always another possible path yet to be dis-proven. You prove what is, not what isn’t.