What's your point, Dave?
The sun and moon are obviously not inhabitable
No one claims that they are.
No one claims that they do, unless you count the oceans of plasma on the sun and the "mares" (latin for seas) on the Moon, which are solidified molten rock, which also fits the Hydroplate Theory from Dr. Walt Brown.
and there fore not like the earth.
Point me to one post on this thread that says that, other than their shape, the sun and moon are like Earth. I dare you.
Only a flat earth can have level oceans
Not true Dave. Dave, I want you to try to imagine something for a moment. I want you to try to imagine, assuming gravity is real (only for the purpose of this thought experiment), a droplet of water floating out in space (and imagine it's somehow able to stay above freezing). What does the drop of water look like?
If you say anything other than a sphere, you would be wrong. The surface tension of the water will not allow it to be anything other than a sphere. This is not gravity however, and shows that things can be spheres even without gravity.
Now imagine (same environment) a gallon of water floating out in space. What does it look like? Does it have a shape? or is it shapeless?
The shape of the water will be a sphere. But not because of the surface tension, but because of it's mass pulling itself together. Gravity keeps it a sphere, because the center of gravity is at the center, and because gravity is pulling inwards in all directions, the water "levels out" around the center of gravity. When water levels out, Dave, that means all the water molecules are as close as possible to the center of gravity. That's it. It's not that it becomes flat (though if you have enough water (such as on a round earth), the water can appear flat. The reason for this is that when a sphere is so large compared to the observer, it's surface appears flat, but only because the observer is so close to it that he cannot see the curve.
For example, if you were somehow able to land on VY Canis Majoris, the largest star known to man, which has a circumference of about 5.46 Billion miles, which is about 2000 times bigger than our sun, without being incinerated, You would not be able to tell if you were on a flat surface or a round one, because the amount of curvature is so miniscule.
Not true, Dave, and you have no way to support that statement.