First let us take a hypothetical situation: If nobody in the world has ever seen a UFO and you are the first one to see it, and in that case, if I ask you about the person who can tell the mechanism of the object, what would your answer be? After thinking for a while, you would be able to say that the creator only can explain the mechanism of this flying object. Some may label this creator as "manufacturer" while others may refer to it as "producer". Whatever be the word you are referring to, accept it!

Then, I would be asking you the very next question: how did the universe come into existence? You might give me an explanation through the big bang theory. But, the fact remains that it was mentioned in the Quran 1428 years back.

"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?"
Quran
21:30

Some of the Qur'anic verses explain facts about Earth, humans, and other creatures. For example, there is an invitation for humans to fly, indicating the possibility of flying, more than 1428 years ago

In Surat Al-Rahman (Chapter 55), Verse 33 states:

"O You jinn and men, if you can penetrate zones of the heavens and the earth, then penetrate! You will never penetrate them except with the power (of science)."

Earth is described as egg-shaped (pointed at the poles, not a perfect circular globe), a fact which was discovered recently in the human history.

In Chapter 79, Verse 30, the Holy Qur'an mentions that:

"And the Earth, after that, He made it egg-shaped."

One verse explains that it is the female bee that makes honey, a very recent bit of knowledge for humans, which is another evidence that the author of the Holy Qur'an could never be a human being about 1428 years ago. Rather, He is the All Knowledgeable One.

"And thy Lord taught the (female) Bee to build its cells in hills, on trees, and in (men's) habitations" (The Holy Qur'an, Chapter 16, Verse 68).

http://www.aljazeerah.info/Islamic%20Editorials/2007/September/The%20Sci...'an%20Is%20His%20Message%20to%20Humanity%20By%20Hassan%20Ali%20El-Najjar.htm

We don't have to see an artist to recognize a painting, correct? So, if we see paintings without seeing artists painting them, in the same way, we can believe God created everything without having to see Him (or touch, or hear, etc.).