Miracle

[bennyboy]

Let us say they were not retarded people.

1. Do you think people who lived whole of their lives in a desert far from sea and lakes in seventh century, could have the idea of halocline?

Yes, because people at that time had invented both language and means of travel. Some of them certainly (I'm talking 100% chance here) traveled to seas and lakes and met people who knew things about them.

2. Do you think they also had the awareness about the precise geographic locations where salt water meets the fresh water?

Since they mentioned it in the Quran, then I would say there's a 100% chance they either knew first-hand about the halocline, or from the reported experiences of others. Yes, absolutely.

First
You have quoted the wrong verse. 16:49 says:

“And to Allah doth obeisance all that is in the heavens and on earth, whether moving (living) creatures or the angels: FOR NONE ARE ARROGANT (before their Lord).”
An Nahl (16)
-Verse 49-

The actual verse is
An Nahl (16)
-Verse 79-

This is the first sign of your negligence.

And yet you do not deny that the Quran claims that the only thing holding up birds is Allah.

Second
• Can birds fly in vacuum?

No, they can't.

• Why other animals (including humans) do not have wings?

Because different animals are different.

• Man has all the scientific knowledge about aerodynamics and mutation so why his dreams to have wings are limited only to Hollywood movies?

Because man can already fly in airplanes, and doesn't have to genetically modify or evolve people with wings.

Third
Who has the power to create air and to give wings to the birds?

Stars / evolution.

Perhaps your answer would be “nature.” If nature has created air and the wings, so who is responsible to keep the birds from falling? The answer should be “nature”.

But what is nature?

It is the phenomena of the physical world collectively, including plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations.

So who is causing and sustaining nature if not man and not God?

Nobody knows why the universe exists. However, obvious fairy tales are obvious, and do not represent an answer to that question.