Christians often ask Muslims, if they have any evidence to offer that the Qur’an is from God. I think it is a valid question from someone who is not yet a believer in Islam.
While the answer can be very subjective, what I think the most notable evidence is the obvious innate ability of the Qur’an recitation to be memorised by heart. Some muslim even are able to recite the whole Qur’an recitation from memory.
This is the clear evidence what makes it from God and this phenomenon can be witnessed all over the world to this very day.
God keeps his promise:
وَلَقَدْ يَسَّرْنَا الْقُرْآنَ لِلذِّكْرِ فَهَلْ مِن مُّدَّكِرٍ
“And We have certainly made the Qur’an easy for remembrance, so is there any who will remember?” [Q 54:17]
This is one of the miraculous nature of the Qur’an which make it the ONLY religious holy book in the world which can be memorised by millions of people word for word from the beginning after it was revealed making sure its preservation. This unique ability of the Qur’an to be memorised is unlike anything like the human brain ability. This phenomenon of people who can memorised the whole Qur’an or حفاظ القرآن Hufaadhul Qur’an into memory exist regardless of ages, social status, cultural background, intelligence etc. It is a living miracle
This makes it impossible for the Qur’an to become corrupted because it was memorised by muslims right after it was revealed to the prophet Muhammad dictated by himself in original language of Arabic verbatim.
It is in opposite reality when it comes to the book of known as the new testament (NT), while Jesus and his contemporaries would have been Aramaic speakers, christians do not have in their possession the original Aramaic utterance of Jesus. Christians rely on greek texts as their basis for understanding Jesus teachings. What we have only is scattered Aramaic expressions here in there in the NT. It is believed that this aramaic corpus of Jesus original gospel of Jesus had been lost.
Listen to Imam Karim Abu Zaid , a Qur’an memoriser himself, when he explains how the Quran is preserved: