[Quran 41:44] If we made it a non-Arabic Quran they would have said, "Why did it come down in that language?" Whether it is Arabic or non-Arabic, say, "For those who believe, it is a guide and healing. As for those who disbelieve, they will be deaf and blind to it, as if they are being addressed from faraway."
Though the Quran was revealed in Arabic, it clearly states that God has promised to be its teacher (Verses 55:1-4) and the One to explain it (Verses 75:18-19).
Reading the quoted verse above, God states that language is irrelevant, and that only the sincere ones are going to understand the Quran irrespective of their language.
Those who can read Arabic can appreciate the excellence of the
literary structure of the Quran. Those who do not, can appreciate the excellence of the
message by reading the Quran in any language.
Getting the message and enjoying the literary excellence of the Quran are two different matters, for example, contemporary Arabs of Muhammad's era listened to the Quran and appreciated its literary excellence but many of them did not believe then (e.g. Abu Jahl and Abu Lahab).
The Quran is a book of a message. God states quite clearly in the Quran that He does not want muslims to face any hardship in following the Quran; i.e. you don't have to learn Arabic to understand and get its message.
It is the message of the Quran that actually counts and it is the part of the Quran that can be translated.
Now why was the Quran revealed in Arabic? It may be due to the efficiency and accuracy of the language.
As for reciting the Prayers in Arabic, specifically reciting surah Al-Fatiha, it has a lot to do with the fact that the Quran is
mathematically composed. Believe it or not, when you recite surah al-fatiha ("the Key"), the Arabic sounds of "The Key" represent a numerical combination (you can learn about that in the above link). A translation of "The Key" would be human-made.
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WA.
but the order in which we have it in the book form is human
Wrong. The order of the Quran is divinely inspired.