Why do some people not want to accept Quran even if it is written about the Big Bang in it before 1400 years ago?

Because they have a belief "my book is true".

 

Until you destroy their belief or change it they won't believe in Quran.

 

They have been engraved since their childhood that their book is from God.

 

If Muslims won't trust their religious books, will they trust Quran is from God? No.

 

And so no matter what is written in their book, Muslim won't accept their book against Quran. Same thing is being done by them.

 

Try to put them in "doubt" about their religious book by the attack of "comparison" along with solid proofs from real world + claims of Allah from Quran because constant attack in their mindset will shatter their beliefs against their own religious book just like atheists perform constant attacks against mindset of Muslims through Quran and Ahadith and when Muslims feel helpless then their beliefs shatter down and so end up leaving Islam because they fail to counter atheists.

 

Your practical proofs + claims of Allah from Quran against their false stories of religious books will destroy their beliefs that their book is true so you can keep proving their claims and stories false by making them helpless against your practical proofs.

 

This will actually help them force thinking into why don't they have practical proofs in real world from their (imaginary) gods as compare to practical proofs from Islam?

 

You practical proofs should be solid, physical, neutral, impartial and irrefutable which should not be a manual work of human being but only the work done exclusively by Allah.

 

That is what will bring comparison of Allah vs their (imaginary) gods (invented centuries ago by former people).

 

Allah created and controls the universe and He has no partner and associates, therefore they'll fail to find practical proofs against your practical proofs because Allah does not do any mistake at all so there is no possibility that their (imaginary) gods can write their names and control creatures of nature to speak and glorify their names against Allah.

 

Quran should not be your practical proof by itself based on what is written inside it as most Muslims copy/paste quotes and it is similarly happening from Non-Muslims as well. Instead, your practical proofs should be divine from real world around you, the external one, observable and should consist on repeatable but irrefutable miracles from Allah.

 

They must belong to system of universe and should be against the laws of nature because only Allah can change laws of nature so non Muslims will feel helpless since they will have no support from their (imaginary) gods since they don't control the universe.

 

Show them your solid, divine, practical and irrefutable proofs from nature and neutral creatures of Allah.

 

If you want to know, learn and study more then study more this website (www.rightfulreligion.com) , or you may also check www.godofnature.org OR www.prophetofnature.com. However, if you want personal counseling session then you can reach out to Moulana Abrar Alam for help.