Q: "What about the stars, sun and moon and other planets? Are they flat too? What are they made of?"
A: The sun and moon, each 32 miles in diameter, circle Earth at a height of 3000 miles at its equator, located midway between the North Pole and the ice wall. Each functions as a "spotlight," with the sun radiating "hot light," the moon "cold light." As they are spotlights, they only give light out over a certain are which explains why some parts of the Earth are dark when others are light. Their apparent rising and setting are caused by optical illusions.
I can agree with that, but I can't get to a good explaination how the moon phases work.
Q: "What about gravity?"
A1: The Earth is accelerating upwards at 1g (9.8m/s-2) along with every star, sun and moon in the universe. This produces the same effect as gravity.
I would say that gravity makes your shit pop out in the loo. I don't know in this answer how accelerating works as you reject science rockets that orbit the earth... ask Isaac Newton how!
Q: "Doesn't this mean we'd be travelling faster than the speed of light, which is impossible?"
Shouldn't this make me laugh? The general theory of relativity uses measurments and axiomas related to a round world.