You're conflating physics and metaphysics.
> Flat earth is very similar to religion
You seem to have a beef to pick with religion. There are religious groups that do function similar to flat earthers, but that isn't true of all religious groups and many of the smartest and open minded people in history have been religious.
If anything, by making this comparison you are legitimizing idiocy.
There's a big difference between taking a position on unknowable metaphysical topics and refusing to recognize or even look at evidence when presented to you.
