Can anyone please refute these verses of Quran (or at least their interpretations)?

[Drich]

Hi everyone! First time poster here. I consider myself to be agnostic; I was born in a muslim family , but I abandoned my faith in my early 20's, alhtough I had been a skeptic ever since my teenage. Because when I heard all the Islamic stories in my text books, I just found them stupid. 

Anyways my question here is regarding some verses of Quran. Just recently, I was watching Zakir Naik's debate with an atheist. The atheist asked how do you know the Quran is word of God; he replied that because there is science in Quran that the modern scientists have come to know about very recently,but it was mentioned in Quran recently, and then Zakir Naik quoted the following verses;

21:30 Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe? 
He claims that above verse mentions big bang.

And the following verse he claims that tell us that earth is spherical:
79:30 And the earth, moreover, hath He extended (to a wide expanse); (I do realize that Zakir Naik is just a showman; and that this verse does not say earth is spherical)

And then he mentions there is genetics, embryology etc in the Quran that science came to know about recently but was mentioned in Quran 1400 years ago.

So will someone please refute the above verses and refute any other so called scientific verses that Muslim apologists claim to be contained in Quran or Hadith

Regards

The above quotes are the reason so many radical chriatians tend to be King James Version of the bible only. Because that bible is speaking in a dead dialect but just enough common language it allows them to interpret anything they want it to say.

This is no different.

Now if you find a honest translation in common english it maybe a little harder to pretend the koran mentions the big bang.
http://www.clearquran.com/