Why does the believer in God's existence have the burden of proof?
The problem is that the skeptic and/or atheist requires scientific evidence for God's existence. But what he or she fails to understands is that belief in God's existence is presented as a metaphysical belief, not as a scientific fact.
If some religion's believer demand that non-believer must obey their God's moral/law, then those believer must give scientific/reality evidence or supernatural/spirituality evidence to prove their God's existence.
For the scientific/reality evidence, i'm not sure about it.
As we can see, we cannot consistently to replicate supernatural/spirituality evidence of any God's existence, it lead to the thinking that it's unreliable, but it nonetheless is still important to those believer as this belief may encourage and give meaning to their life and make them a good person.
All this "evidence" or "theory/presupposition/assumption" is only personal and subjective to a person.
If any religion's believer demand that non-believer must obey their God's moral/law, it's reasonable for non-believer to demand the objective evidence of those religion's claims, and demand this objective evidence can be consistently be replicate to show to them for then they can be convince.
If no any religion demand that non-believer must obey their religion's God's moral/law, then maybe it's likely that no any non-believer will demand such "evidence".