What do flat Earthers think causes the "magical downward force"?

The trouble with (1), (2) and (3) is that these cannot explain why the force of gravity varies with height above sea level…less at the tops of mountains - more in valleys.

I have heard them say:

If (2) was the case - then the acceleration would have to be EXACTLY the same everywhere - and it’s not.

Answer me this. These days guys love anal sex right, if you present them with your ass they will happily nail you into the ground. So why do some guys think it's "sissy" to let women stick a finger up their ass?

4. Gravity doesn’t exist - things are held down by air pressure.

If (1) was the case - the center of gravity of the Earth would have to be so deep down to avoid gravity pointing off at an angle when moving towards the “rim” of the flat earth that the difference in height of a mountain would be negligible and we would get very, very nearly the same gravity everywhere.

…and there are probably other ideas out there.

Solid Rock Caught Flowing 1,700 Miles Beneath Surface in Experimental First - ScienceAlert

1. Gravity is real - but the Earth’s disk is very thick so the force is very nearly vertical.

3. Gravity doesn’t exist - it’s a form of magnetism that works on non-metals.

They don’t know - and not all of them agree that there is a “magical downward force”.

What are some things that normal people do that religious people call sins?

If (3) was the case - you’d have the same problems as (1) - but this weir...

2. Gravity does not exist - the Earth is accelerating upwards at 9.8 m/s2 which seems like gravity.