Wake up sheeple! Gravity is an obvious lie from the NWO illuminati lizard people! We're actually all implanted with small steel sheets in our feet at birth, and everything on the planet has a small amount of iron filings in too. The flat disc we live on is completely magnetic. That's how we don't fall off.
I remember a guy arguing that flat Earth is constantly accelerated upwards on God's will, and never reaches speed of light due to Einstein relativism. Was quite fun to listen to this unusual fusion
If you look into it, you'll realise the underlying theory quite obviously came to be when someone very smart tried to figure out how could a flat earth work without throwing all physics out of the window. It's actually pretty neat. There are obviously details that can be tested for and the model disproven, but it does account for a lot. IIRC the basis is that the flat Earth is constantly accelerating at 1g, which provides gravity. Per theory of relativity you can accelerate at a constant rate for an arbitrary length of time, so that works. I think stuff such as phases of the Moon etc are also accounted for, though I don't remember the details of that.
Really, people get too caught up in finding holes in the model when the most obvious flaw is that the whole thing requires tens of thousand people at least all knowingly covering this up without getting anything out of it. But if you look at it as a thought experiment, not an attempt to describe the reality, you'll find that it's really pretty cool. Or, it was cool, before idiots started to actually believe it.
If the disk had the thickness of Earth's diameter and through some black magic fuckery made it so that only the mass directly below you affected the force of gravity on you, then yes.
It's probably easier to make an FTL engine than to make any sense of flat earth theories.
There's probably some distribution of mass that would result in uniform gravity across the whole disk. I'm guessing there would need to be more mass near the edge to counteract the diagonal pull of the mass near the center on the area near the edge.
The problem is that in a flat plane with any amount of thickness, there will be always more mass diagonally than vertically, and it would still require a curve to evenly distribute the mass. I am by no means an expert on the matter, but from what I can recall, the only geometrical shape that allows for it is either a sphere or some complex hyperbolic curve, which is still not a plane.