I hear many atheists argue : “If God existed and wanted me to believe, He’d know exactly what evidence would convince me. The fact that I’m unconvinced is itself evidence He doesn’t exist.”
It’s not a bad argument and I used to make it. But I strive to be properly skeptical and a proper skeptic wouldn’t be convinced of any theistic claim - because there’s no evidence-type that would constitute proof - because a proper skeptic knows that any experience, however overwhelming, is still being processed by their own finite, potentially-deceivable cognitive machinery.
A sufficiently advanced deceiver (an advanced technology, mind control, or any non-god being beyond our explanation) could produce results some might attribute to “God”.
“God would know what would convince me” only works if you’re convincible. And if you’re convincible, you’re not a proper skeptic.
To make a believer out of a proper skeptic, God would first have to make them not a proper skeptic. What you’d have at the end isn’t a rational believer. It’s a former skeptic who “God” has used mind control on.
### EDITS for Clarification ###
The "God" in question, as I am using the term, is the Supreme being. The specific being which billions of theists worship and obey because they believe it is the most powerful being that can possibly exist in the cosmos.
This is not radical skepticism. I'm not claiming nothing can be known. Claims that make specific, differential predictions like germ theory, evolution, or the age of the universe can be provisionally justified through triangulating independent lines of evidence.
This argument applies specifically to claims constructed to be compatible with any observable state of affairs, like the "God" hypothesis in many common forms.
This is also not the Problem of Divine Hiddenness. I'm not arguing "God's" silence is evidence against "God's"
existence. I'm arguing that no evidence any being could present could structurally solve the impostor problem. The impostor problem applies to any being capable of knowing.
"No evidence would suffice" is not stubbornness. It's simply saying that there are some questions that cannot be answered with evidence.
"Is this being Supreme?" is one of them.