The Big Bang in the Qur’an?

There are three main problems with what’s said here:

1. As with most scientific miracle claims in the Qur’an, A LOT is read into a vague text. All it says is that “the heavens” and “the earth” were once together and that God separated them. It’s a BIG jump from this basic statement to the Big Bang Theory (a theory first suggested, not by a Muslim reading this Qur’an, but by a Catholic priest).
2. The idea of God (or the gods) separating and organizing creation isn’t unique to the Qur’an. If this is a proof, then many other religions of the world are vindicated.
3. Most importantly, the Qur’an says that EVEN UNBELIEVERS recognize that the heavens and the earth were separated. If this was common knowledge among unbelievers, what is exactly is the miracle of the Qur’an?