This is what I have gathered from Qur'an which will help you guys to rethink....InshAllah!
***(1) The Quran is a complete book, See 6:19,38,114, 115, 12:111 and 50:45.
Remember that when God says that His book is complete, it means 100% complete. **
"..........We did not leave ANYTHING out of this book." 6:38
"(Say): "Shall I then seek for a judge other than Allah, and He is (Allah) who has revealed this Book to you fully explained?" And those whom We gave the Book(aforetime) know that it is revealed from your Lord with the truth; so be not you(O Prophet) of the doubters." 6:114
"And perfect are the words of your Lord in truthfullness and justice; there is none who can change His words; and He is the Hearer, the Knower." 6:115
"......This(Qur'an) is not tale forged, but a comfirmation of what is before it, and a DETAILED exposition of EVERYTHING and a guidance, and a mercy to a people who believe." 12:111
"The word of your Lord is COMPLETE, in truth and justice. Nothing shall abrogate His words. He is the Hearer, the Omniscient." 6:115
*(2) The Quran is perfect; no mistakes, no falsehood, no nonsense. *
"No falsehood could enter it (Quran), in the past or in the future; a revelation from a Most Wise, Praiseworthy." 41:42
".......All ruling belongs to God, and He has ruled that you shall not worship except Him. This is the PERFECT RELIGION, but most people do not know." 12:40 (see also 30:30, 30:43 and 98:5).
*(3) The Quran is detailed, and when God says He detailed His book it means FULLY detailed. God does not do half jobs. *
"Shall I seek other than GOD as a source of law, when He has revealed to you this book fully detailed? Those who received the scripture recognize that it has been revealed from your Lord, truthfully. You shall not harbor any doubt." 6:114 (See also, 7:52, 11:1, 41:3, 10:37 and 12:111)
"And this Qur'an is not such as could be forged against Allah, but it is a confirmation of that which was before it, and a detailed exposition of the Book; therein is no doubt, it is from the Lord of the worlds." 10:37
"And certainly We have brought them (the disbelievers of all times) a Book which We have expounded with knowledge, a guidance and a mercy for people who believe." 7:52
*(4) God does not need any addition to His book. God teaches us in the Quran that He does not run out of words and that if He so willed He could have given us hundreds, thousands or millions of books besides the Quran (see 18:109). Since the Quran is complete, perfect and fully detailed, God did not give us any more books. *
"Say: "If the ocean were ink (wherewith to write out) the words of my Lord sooner would the ocean be exhausted than would the words of my Lord even if we added another ocean like it for its aid." 18:109
*(5) God calls His book, the Quran, the BEST HADITH. HE called on His true believers to accept no other hadiths as a source of this perfect religion . See 7:185, 31:6, 39:23, 45:6, and 77:50. *
"Have they not looked at the dominion of the heavens and the earth, and all the things God has created? Does it ever occur to them that the end of their life may be near? Which HADITH, besides this (Quran) do they believe in?" 7:185
"Allah has (now) sent down the most excellent discourse, a Book alike throughout, oft-repeating(its teachings), whereat shiver the skins of those who fear their Lord, then their skins and their hearts soften to Allah's remembrance. This is Allah's guidance- He guides with it whomsoever He will. And he whom Allah sends astray, there is no guide for him." 39:23
"These are the revealations of Allah, which We recite to you (O Prophet) in truth. Then in what discourse, after Allah and His revealations, will they believe?" 45:6
*(6) God calls those who prohibit what He did not prohibit, transgressors, liars and idol-worshipers. Idol-worship is the only unforgivable sin, if maintained till death. See, 5:87, 9:37, 7:32, 6:119, 6:140 and 10:59. *
"O you who believe, do not prohibit good things that are made lawful by God, and do not transgress; God dislikes the transgressors." 5:87
"Say, "Did you note how God sends down to you all kinds of provisions, then you render some of them unlawful, and some lawful?" Say, "Did God give you permission to do this? Or, do you fabricate lies and attribute them to God?" 10:59
**(7) Muhammed is represented only by the Quran. The Prophet Muhammed was the last Prophet and a messenger of God (33:40). He was not the messenger of God because of who he (Muhammed) was, but because he was given the Quran (the message) to deliver to the world. The religion of Islam is a religion of God, not about Muhammed, who was blessed by God with the delivery of the message of the Quran. He did not have an agenda of his own. His job was to deliver to the world what God was giving him, the Quran. See 42:48, 13:40, 5:99-100.
Muhammed cannot prohibit things, or make lawful things on his own. When he tried to do that God admonished him publicly, see 66:1 **
"O you prophet, why do you prohibit what GOD has made lawful for you, just to please your wives? GOD is Forgiver, Merciful." 66:1
"But if they turn away, We have not sent you (O Prophet) as a watcher over them. Your duty is only to convey the Message. And surely when We let man taste mercy from Us, he rejoices therewith. And if some evil befalls them because of what their own hands have forwarded, then surely man is ingrate." 42:48
"The duty of the Messenger is only to convey (the Message)." 13:40
66:1 reminds us that God is the only ONE to prohibit or make things lawful. NO ONE can attribute to Muhammed a prohibition that God did not give him in the Quran. Anyone who tries to do so is admitting his/her refusal of God's words and commandments in the Quran.
**(8) The TRUE believers KNOW that when God says something, He means it, and when He does not, he means it as well. Everything given to us in the Quran was done deliberately and everything left out was also left out deliberately.
God does not forget. **
"....And your Lord is never forgetfull." 19:64
*(9) God calls on His TRUE believers to verify every piece of information they see, hear or read. *
"You shall not accept any information, unless you verify it for yourself. I have given you the hearing, the eyesight, and the brain, and you are responsible for using them." 17:36 *