Islam or Atheism

[Muslim Scholar]

That the earth was a sphere had been known for a very long time prior to the manufacture of the quran. In fact, the points where the quran gets things right (and the points where the quran gets things wrong) all lay along the line of what was already known to man. "People" didn't think that the earth was flat, "certain people" in this particularly shitty backwater of the world thought that the earth was flat.

How about when God said in the Quran that the Universe is expanding
or telling about exact incidents in the future

If you look to the amount of scientific facts and future prediction in Quran, it cannot be fabricated (specially by Mohamed)