One of the weaknesses of the Flat Earth crowd is their submission to easily one of the most preposterous God arguments in existence. None of them seem familiar with Pandeism or are able to integrate a holographic universe argument and/or decoherence model into their thinking.
That said Allegedly Dave is a pretty awesome guy and demolishes much of the construct that consumer society calls reality in this discussion here.
Is the Earth flat? I don't know. I quite like the sphere.
Is NASA lying their tits off?
Absolutely and the NSA cover their asses.