これは信念の問題ではなく、地球が平らではないという圧倒的な科学的証拠であると言うでしょう。

悪魔の擁護者を演じても、平らな地球に対する遠隔的に説得力のある議論を思いつくのは私の能力を超えています。ごめんなさい。
I would not say that this is a matter of belief, but rather the overwhelming scientific evidence that the Earth is not flat, which was known for thousands of years since the time of the ancient Greeks.

Even playing the Devil's Advocate, it is beyond my abilities to come up with a remotely convincing argument for a flat Earth. I'm sorry.