When Atheists ask for scientific, or scientifically verifiable, evidence of or for God’s existence there are a plethora of issues to consider.
Firstly, they should be asked to justify demand for evidence. This is because all of us believe in and/or otherwise hold to certain views without any regard for evidence. For example, our various worldview-philosophies are ultimately founded upon a basis, premises, presuppositions, assumptions, axioms, etc. and these are not proven or evidenced but rather, are assumed, intuited, etc.