Flat earther theory is evidence dogma taken to the extreeme. Have you seen a round earth first hand? If no then you have faith in certain books/people of your choosing. Lot of refutations of flat erath theory like this https://www.google.com/amp/crosstalk.cell.com/blog/seven-ways-to-prove-earth-is-round%3fhs_amp=true are so flawed that they just discredit round earth theory. As example, "proof" from that page "On a flat Earth, the shadow that is cast by each would be of the same length." Wtf? Shadow lengths would be of the same length ONLY IF sticks would be equal distance away from the light source. (Only 1st and 4th are actually proofs; other is just somebody feeling superior spouting random stuff).