The universe was created by a Big Bang.
The Qur'an says that the heavens and the earth were united, tight and compact.

[Quran 21.30] . Do those who disbelieve ever consider that the heavens and the earth were at first one piece, and then We parted them as separate entities; and that We have made every living thing from water? Will they still not come to believe?

In the Quran, the heavens widened from a single point.

How could an illiterate who lived 1400 years ago know that the universe came from a Big Bang?

The universe has been expanding since the Big Bang.

[Quran 51.47] We have built the sky with might,
and indeed it is We who are its expanders.1

How could an illiterate who lived 1400 years have known the expansion of the universe?

د ذاكر نايك يحطم الإلحاد Dr Zakir naik destroyed the Atheism - The Big Bang in Quoran

https://www.youtube.com/watch?v=54LbidDFPYM