Problems With Anti Hadeeth Methods When Interpreting The Quran

The Anti Hadeeth have a deep believe that the Quran must only be interpreted by the Quran. Any other external information must never be applied to the Quran as it is not from God.

The trouble with this method is that it will translate into the Quran having a lot of contradictions.

For example:
1) In 5:69 "Innal-laziina 'aamanuu wal-laziina haaduu was-Saabi'uuna wan-Nasaaraa man 'aamana bilaahi wal-Yawmil-'Aakhiri wa 'amila saali-hanfalaa khaw-fun 'alay-him wa laa hum yah-zanuun."
You notice that the word was written Saabi'uuna in 5:69 and was written Saabi'iina in 2:62 and 22:17. In the last two verses the word was declined correctly because the word inna in the beginning of the sentence causes a form of declension called "nasb" (as in cases of accusative or subjunctive) and the "yeh" is the "sign of nasb". But the word Saabi'uuna in 5:69 was given the 'uu, waw which is the sign of "raf'a" (as in cases of nominative or indicative).
Based on Anti Hadeeth methods, this will result in contradictions in the Quran
2) In 7:56 "The mercy of God is near."
"... inna rahmata Allahi qaribun min al-mohseneen."
The above verse is a nominal clause. In such a clause the predicate should match the subject (rahmata) of the nominal clause in gender. The word qaribun (meaning "near") is the predicate of rahmata Allahi ("mercy of Allah"), they should match each other in gender. But this is not the case in the Arabic text. Rahmata is feminine in Arabic and so the word qaribun (which is masculine) should instead be qaribah (its feminine form). This rule was correctly observed in other Qur'anic verses. For example, in 9:40 we read: "Kalemat ul-llah heya al-'ulya."Here both Kalemat and heya are feminine. To say instead: "Kalemat ul-llah howa al-'a'la" would never be correct. That would be just as wrong as saying: "... inna rahmata Allahi qaribun min ... "
Based on Anti Hadeeth methods, there’s a contradiction in the Quran


3) In 41:11 "Then He lifted Himself to heaven when it was smoke, and said to it and to the earth,'come willingly, or unwillingly!' They said, 'we come willingly.'"
"... faqal laha wa lel-Arad 'iteya taw'aan aw karha qalata atayna ta'e'een."
Heaven and earth in Arabic are feminine nouns, the verb said in "they said" is accordingly feminine and dual (qalata), but the adjective "willing" at the end of the verse is masculine and plural (ta'e'een), being at variance with the rule that the adjectives should match their nouns in number in gender, thus ta'e'een which is used for plural, should be ta'e'aat which is used for feminine dual.
Based on Anti Hadeeth methods, there’s a contradiction in the Quran
4) In 20:63 "They communed secretly saying, 'These two men are sorcerers'." (Arberry)
"Qaaluuu inna haazaani la-saahiraani ..."
The word saahiraan should be saahirayn. The word saahiraan was declined incorrectly because the word inna in the beginning of the nominal sentence causes a form of declension called "nasb" to the nominative and the "yeh" is the "sign of nasb". The entire Quran observes the singular, dual and plural rule?
Based on Anti Hadeeth methods, there are contradiction in the Quran as showed above.
As a reminder, the pathetic accusations above are taken from anti Islam websites (not to say that anti hadeeth themselves are not anti Islam). Answers have been provided adequately and I long to see how Anti hadeeth can rebut this effectively based on their methodology.
But, as an initial conclusion, suffice to say that anti hadeeth beliefs are useful to anti islam elements of the world as they will never be able to defend the Quran effectively. It will then result in the Quran being rejected and mocked beyond any recognition.