Who's mad, who posited a fallacy and who said all religious people are dumb? Dont assume nonsense, read what is written and don't project.
First, just because some religious scholars thought the world was a globe, doesn't mean all did.
St. Augustine among them. "But as to the fable that there are Antipodes, that is to say, men on the opposite side of the earth, where the sun rises when it sets to us, men who walk with their feet opposite ours that is on no ground credible."
Chrysostom, Archbishop of Constantinople also believed in an "earth floating in water, beneath the firmament".
And here, how about this, straight from a "horses" mouth. Now, I'll grant that this is modern interpretation, but sure it shows just how easily flat earth nonsense can be interpreted from the bible.