Are you having doubts about Islam? Read on...

Q. Various non Muslims says that the Qur'an has many scientific errors and I began to have doubt can anyone help? 

A. Brother I have just visited your provided link and I can say with confidence that they have only quoted verses from Holy Qur'an and provided no evidences that Holy Qur'an is against proved science. I don't have that much time to answer all of this but I'll try to touch some major points. Their foolishness is clearly visible from the first para, they quoted
1. EvolutionThey state,
The Qur'an advocates creationism. It is incompatible with the thesis of human evolution from simpler life forms and natural selection. This is not very controversial as reliable statistics on the subject have shown most Muslims agree Islam and evolution are not compatible. (wikiislam.net)
Answer: You see they are supporters of Theory Of Evolution which is a baseless theory and Science itself doesn't approve it. They have not provided any evidences in support of Theory of Evolution, but they only say that "Holy Qur'an is incompatible with thesis of human evolution", Lolx this is no proof to say that Holy Qur'an has an error rather this theory is itself incompatible with science. There will be no Christianity, Judaism or Islam if you believe in Theory of Evolution. I think Atheists are the owners of this website.
2. Human created from clayThey state,
The scientific hypothesis postulates that clay merely 'match-makes' RNA and membrane vesicles - and therefore does not form a building block. This is contrary to the Islamic faith which postulates that human beings were created from clay, implying clay was a building block. (wikiislam.net)
Answer: Again a hypothesis with no references and half knowledge. I must tell you it not only Islam but Christianity and Judaism also tells us that Human Being are created from Clay or Dust mixed with water and you will find many explanation in support of this from Christians as well and today Science proves this, you can find a detail explanation on the following links
http://www.elnaggarzr.com/en/main.php?id=39Plus you can find what Christians say regarding man created from clay on the following link,
http://esoriano.wordpress.com/2007/05/25/from-dust-to-man-a-scientific-proof/3. The sun set into the murky waterThey state,
The Qur'an propagates the idea that the sun is smaller than the earth and assumes the sun goes to a black muddy pool. (wikiislam.net)
Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: "O Zul-qarnain! (thou hast authority,) either to punish them, or to treat them with kindness." (Holy Qur'an 18:86)
Answer: Point to be noted here is that Holy Qur'an clearly states from the perspective of Zul-qarnain, that what Zul-qarnain saw from him eyes. Likewise when we go to a beach and during the sun-set when we see the Sun it looks like that the Sun is setting into the Sea but we all know that Sun doesn't set in Sea but our eyes see that Sun is setting into the Sea.
4. GeocentricismThey state,
The Qur'an mentions numerous times that the Sun and the Moon travel in an orbit, but does not mention once that the Earth does too. This is consistent with the beliefs that were prevalent prior to the 16th century that the Sun revolved around the Earth. (wikiislam.net)
And the Sun runs his course for a period determined for him: that is the decree of (Him) the Exalted in Might, the All-Knowing. (Holy Qur'an 36:38)
Answer: If you read carefully they sub-consciously proved that Holy Qur'an is the word of God. Look they said "This is consistent with the beliefs that were prevalent prior to the 16th century that the Sun revolved around the Earth.", and we all know that Holy Qur'an was present 1400 years ago means 6th century so Holy Qur'an gave this information 10 centuries before which proves that Holy Qur'an is the word of God. Secondly they said "but does not mention once that the Earth does too", I show you where Holy Qur'an says about the rotation of Earth even with the exact direction of rotation, Holy Qur’an says,
And you see the mountains, thinking them rigid, while they will pass as the passing of clouds. [It is] the work of Allah , who perfected all things. Indeed, He is Acquainted with that which you do. (Holy Qur’an 27:88)The above verse emphasizes how the mountains and therefore the Earth itself moves in the same way that clouds do. The direction of movement of the main cloud masses that some 4000 meters high is always from West to East, this direction is the same as that in which the Earth rotates around its own axes, therefore it is miraculously revealed in the verse that the earth moves from West to East the same direction as followed by the clouds and this was revealed in Holy Qur’an 1400 years ago at a time when people didn’t believe that the earth was round, that it revolves around its own axes and that it travels from West to East. Subhan Allah
Brother I would advice you to not doubt in Allah (S.W.T) and do not make these anti-islamic sites the source of your knowledge because they are astray and wanted to make Muslims go astray from the deen of Allah (S.W.T). Brother you should read Holy Qur'an with translation, listen/watch the audio/video Islamic Lectures and read Islamic Books.
There is no error in the Quran. And the site you describe doesn't represent the authentic site. What ever matter there given should be checked by you in the Quran and if you face problem in understanding the meaning then take help from Mufti, Imam, Hafeez, Qari.... You will get satified and believe that Quran is true, There is no error in it. AND DONT SEARCH THIS TYPES OF WEBSITE. SOME PROVIDE AUTHENTIC KNOWLEDGE BUT SOME CREATE CONFUSION AND MISLEAD PEOPLE AS THEY ARE MANAGED BY NON MUSLIMS
Bro go to islamic site instead of anti islamic site
wikiislam is an anti islamic site the try to humilate islam
but they can match our best religion

The above taken from a genuine Islamic site - www.islam.com. For the moment I'll just let you digest the implications of such overt brainwashing which is going on all over the internet.
Discussion to follow.