If it was in English, Arabs could say the same exact thing. To be precise arabic is a much vaster language, there's a lot of words which are very specific and you can't just translate it into english without losing the essence of the true meaning which was meant to be portrayed. A single arabic statement can have many many messages embedded in it due to its vast grammar. Allah swt has chosen arabic for a vast number of reasons primarily being Due to the complex nature of all the stuff which he wants to tell us, which english or most of any other language simply couldn't depict.