I agree with Yaz. While most intellectual theists have the good sense to know that metaphysical claims cannot be supported with physical evidence, atheists are the only ones making evidentiary claims.
I don't agree that they are.
Not if you actually listen to what they mostly say.
They say that there is no evidence that convinces them, and that what theists might consider to be evidence of God, they (the atheist) do not.
Explanations on either side is a matter of the individual, not the group as a whole.
And as such, the latter's claim that there is no good evidence of a god seems to infer some degree of exhaustion of possibilities...and even some irrational presumption on the nature of metaphysical evidence.
I don't think this is true, either.
Admittedly the wording they use may be poor and not convey their full position, but mostly, from experience of discussions, only the strong atheists would fit your notion.
The weak atheist generally leaves open the possibility of evidence in any form, although most would also not be able to state what that form might be.
Simply assuming there should be physical evidence for a god is a denial of the metaphysical nature of such things.
It is, but I don't know of any atheist who makes such an assumption.
Usually the issue of physical evidence is around the theist claiming there is some, and the atheist putting forth arguments as to why the evidence presented is not, in their eyes, evidence at all.
The argument of indistinguishability, for example.
So no matter to what degree removed, the arguments of atheism are grounded in denial...of the thing's nature, if not the thing itself.
I don't see this as true, either.
The strong atheist, quite possibly.
There aren't actually that many of those with regard all concepts of God, however.
And as I understand the term, to deny something one must either not accept the known truth (aka delusion), or simply say that something (whether true or not) is not true (strong atheism).
The weak atheist merely is not convinced there is even anything to deny, whether they accept the possibility of something with God's nature or not.
No denial.
Just no acceptance that it is true, when they do not know whether it is true or not.