To the “some” God is
believed to be a “known”
entity, yet nobody has ever been able to actually demonstrate that to be true.
If God were known to exist and could be measured, observed and tested…..
there would be valid measurements, confirmed observations and verified test results;
and yet there are none.
So again, what “some say” often isn’t correct and the fact it was uttered has no bearing on that correctness.
Yet they agree that the Earth exists.
And, since the tests are demonstrable, they can easily expand their knowledge base to include the verifiable facts, as you have demonstrated to yourself having personally seen the curvature.
While you may not have personal access to a ship or plane doesn’t mean it can’t be proven….
Anyone can get access to a ship or plane, the fact that
you don’t have the immediate means to give them access doesn’t prevent it from being proven. There are also many other means to prove that it isn’t flat that have been known since the ancient greeks.
( see:
Eratosthenes - Wikipedia)
The problem with the question of whether or not a god/s exist is that it is often an
unfalsifiable claim, which is why I can’t honestly rule out the possibility (and thus my agnostic designation).
The question of whether or not the Earth is flat
is falsifiable (and has been falsified) so anyone that honestly investigates it
without cognitive bias will inevitably arrive at the conclusion of it being spheroid.
So what “some” people
believe, claim, say about, and
call things doesn’t make what they
believe, claim, say about, and
call things accurate.
A reasonable competent person will validate what is
believed, claimed, said about, and
called, in order to determine if it comports with what has verifiably confirmed to be objectively factual.