There shall be no compulsion in [ acceptance of ] the religion. The right course has become clear from the wrong. So whoever disbelieves in Taghut  and believes in Allah has grasped the most trustworthy handhold with no break in it. And Allah is Hearing and Knowing. (Quran 2:256)
 Taghut : Taghut – An Arabic word that covers a wide range of meanings. Basically it is anything worshipped other the one True God and includes satan, demons, idols, stones, stars, the sun or moon, angels, human beings, saints graves, rulers and leaders etc.
It (the Qur'an) is a Book We have sent down to you, full of blessing, so let people of intelligence ponder its Signs and take heed. (Surah Sad: 29)
Have those who disbelieved not considered that the heavens and the earth were a joined entity, then We separated them, and made from water every living thing? Then will they not believe?” (Quran 21:30)
And the heaven We created with might, and indeed We are (its) expander.” (Quran 51:47)
And We have decreed set phases for the moon, until it ends up looking like an old date branch. It is not for the sun to overtake the moon nor for the night to outstrip the day; each one is swimming in a sphere. (Qur'an, 36:39-40)
O assembly of Jinn and mankind, If you are able to penetrate beyond the realms of the heavens and the earth, then penetrate. You cannot penetrate without power. [ Qur’an 55:33]
And in your creation and all the creatures He has spread about there are Signs for people with certainty. (Qur’an 45, 4)
Note: Brothers and Sisters please visit the website to read about the very basic and signs given my our Creator.
Basic info: http://www.introductiontoislam.org/index2.shtml
O you who have believed, if there comes to you a disobedient one with information, investigate, lest you harm a people out of ignorance and become, over what you have done, regretful. (Qur’an 49, 6)
And never concern thyself with anything of which thou hast no knowledge: verily, [thy] hearing and sight and heart - all of them - will be called to account for it [on Judgment Day]! (Qur’an 17,36)
Note: Dear brothers and sisters meet Muslims and visit mosques, read Quran and authentic biography of Prophet Muhammad PBUH (e.g. The Sealed Nectar or by Martin Ling's book Muhammad) ask their learned people if you have any question. Beware of haters, bigots, or simply ignorant people from any background including so called Muslims. There are many American and British (meaning Non Arab) revert Muslim Scholars whom you question about ISLAM or watch their videos on the internet (just a suggestion). Bottom-line is please investigate with open-mind and right source of information.
We have not sent you (O Muhammad) but to all mankind as a giver of good news and as a Warner, but most people do not know. (Quran 34:28)
Will they not ponder the Qur'an? If it had been from other than Allah, they would have found many inconsistencies in it. (Qur’an 4, 82)
Truly, the worst of all creatures in the sight of Allah are the deaf, the dumb, those who do not use their reason/think. Qur'an 8:22
Abraham was not a Jew nor yet a Christian; But he was upright, and bowed his will to Allah's (which is Islam) and he joined not gods with Allah.”(Qur’ān 3:67)
And will make him ['Iesa (Jesus) ] a Messenger to the Children of Israel (saying) : "I have come to you with a sign from your Lord, that I design for you out of clay, as it were, the figure of a bird, and breathe into it, and it becomes a bird by Allah's Leave; and I heal him who was born blind, and the leper, and I bring the dead to life by Allah's Leave. And I inform you of what you eat, and what you store in your houses. Surely, therein is a sign for you, if you believe. (Qur’an Ch:3: Verse 49 )
(Remember) when the angels said: "O Maryam (Mary) ! Verily, Allah gives you the glad tidings of a Word ["Be!" - and he was! i.e. 'Iesa (Jesus) the son of Maryam (Mary) ] from Him, his name will be the Messiah 'Iesa (Jesus) , the son of Maryam (Mary) , held in honour in this world and in the Hereafter, and will be one of those who are near to Allah." (Qur’an Ch:3: Verse 45)
“Or have they taken for worship (other) gods besides Him? Say: ‘Bring your convincing proof: This is the Message of those with me and the Message of those before me’. But most of them know not The Truth, and so turn away.” (Qur’ān 21:24)
“These our people have taken for worship gods other than Him: Why do they not bring forward an authority clear (and convincing) for what they do? Who doth more wrong than such as invent a falsehood against Allah?” (Qur’ān 18:15)
Will they not, then, consider the Qur'an? If it had been from [any] other than Allah, they would have found within it much contradiction. Qur’an 4:82