Invisible Elephants

I have always found it surprising how many believers won't accept this:

And we should remember that the burden of proof is not on the disbeliever to demonstrate there are no gods, but on believers to demonstrate that there are. Believers are not justified in affirming their belief on the basis of another’s inability to conclusively refute them, any more than a believer in invisible elephants can command my assent on the basis of my not being able to “disprove” the existence of the aforementioned elephants. If the believer can’t provide evidence for a god’s existence, then I have no reason to believe in gods.