Epistemology is a rabbit hole, but ... I think it is useful to observe there is a way to categorize what people regard as truth.
1. Things the vast majority accept as true, roughly speaking - F=MA, Putin rules Russia, water boils at 212 degrees fahrenheit at sea level, Lindbergh was first to fly the Atlantic, US Declaration of Independence in 1776, Trump was the 45th president, the earth is round (oblate spheroid). These things have many consistent connections to each other, are documented in multiple original sources, and are relied on in daily life. Physics, chemistry, biology, history. These are sometimes controversial in small part, but physicists agree on a huge amount of physics (tested by use in gadgets) even if they don't agree on string theory or quantum.
2. Things that only a few have figured out the truth of and are contrary to the general beliefs held above. These include black helicopters, 5g mind control, microchips in vaccine, Q, reptile overlords, chemtrails, etc, and of course flat earth. All these require some combination of conspiracy, ignoring of some evidence, violations of the laws of physics, impossible technology, acceptance of inconsistency with known fact, and creation of whole new phenomena whose only proof of existence is that it is necessary to support a conclusion that has already been made.
Example: Bob Knodel and his ring laser gyroscope sees 15 degree/hr precession, concludes there must be an unknown force they can't identify or measure.
The conspiracy has to be global, multi-generational, immensely powerful, yet secret, meaning so small and inexpensive that it can be hidden. The details are never available, it is always vague.
Example: A tiny number of people at NASA convince the majority that the earth is round and make their space shots seem real. The question "Who at NASA and SpaceX knows the truth and who is a dumb sheep?" can never be answered, just a continuing insistence that NASA can and does control everything from "stick pushers" to the "ice wall patrol". Simultaneously huge, powerful, complete, and yet tiny and invisible.
I claim category 1 is science, and category 2 is faith. In science, you look at all the facts and conclude, even if you don't like the results. In faith, you decide what you want the results to be and change or disregard any conflicting observations. If you look into any faith based belief, it requires conspiracy and disregarding facts and logic.
You can use category 1 to do useful things, like navigation. Category 2 does not produce useful gadgets. There are many category 1 navigation devices (astral, inertial, gyrocompass, time/speed/distance, odometer, geodetic markers), no FE map, sextant, star chart, nothing.
Whatever woeds you want to put to it, however you want to argue, I think FE is category 2, and category 2 is an excellent bet to be bs.
I don't like it that the earth is round, I would prefer we could measure distances in a flat plane, the notion of the water being held in quite opposite directions on opposite sides of the earth is difficult to accept or feel comfortable with. But the earth is round.