Don't make an argument about the quran while you have a complete ignorance of it,please study the quran very well so you can discuss it with knowledge.
The verse which you mentioned says that God made it easy for memorizing.
And We have certainly made the Qur'an easy for remembrance, so is there any who will remember? (54:40)
Watch how a child memorizing the quran while its not his native language
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Shaikh Fahad Al Kandari cries after seeing a young boy from Turkey memorize the Qur'an - YouTube
Here is a very good example of Muslims' "inventing" ever new meanings of words only to justify Quran. But I have the antidote. The two Arabic keywords used in this verse are "az-zikr" meaning "to mention for clarity" and "muddakir" meaning "one who thinks and tries to understand." Wow... I need not say anything else! You have been refuted. Neither do you seem to have any knowledge of Arabic, nor have you really tried to find out the truth.:clap