Ok, I am a relatively firm believer that the Earth is round, though I would be interested if somebody could explain to me their point of view. Then I will explain mine. And please, don't just turn this into a cyber shouting match.
The definitive answer is:
"The earth looks flat, therefore it must be."
Nothing presented to support RE theory will be accepted without definitive proof, yet everything supporting FE theory is accepted without proof such as:
Celestial gears, NASA guards at the south pole, shadow moon object, massive space conspiracy, magic gravity, bendy light, etc.
You get used to it after a while.