[UnionsOfSolarSystemPlanet]

Does the flat earth society even try to put together a theory regarding the creation of our universe? Or is just, gravity is wrong, heliocentric model is wrong, but the big bang is right?

You can't be a flat Earther if you believe the Big bang is right.

Is there any proof that anything floats in a vacuum?

The fact that we don't have proof anything floats on vacuum, is a proof that buoyancy is a product of downward force of gravity.

Big bang actually doesn't account for shapes of planets, how they were formed or anything.

Knowing how farm a wheat doesn't mean you know how to make bread with the wheat.

[Unsure101]

You can't be a flat Earther if you believe the Big bang is right.

Unless the FE was the "lid" of whatever held the big bang and has been accelerating ever since the almighty kaboom

[BlueMoon]

You can't be a flat Earther if you believe the Big bang is right.

Unless the FE was the "lid" of whatever held the big bang and has been accelerating ever since the almighty kaboom

The math doesn't work out the same.  The big bang is based on the (correct) model of the moon orbiting the round earth, which orbits the sun.  The scale would be all wrong if the earth was flat and the sun was that close.