Is it doctrinally incorrect to say that Classical Arabic alone is not the language spoken by God?

The questioner bears no fault for what he said to his companion in classical Arabic, and this does not undermine his belief. However, one must consider the cultural and social context of the interlocutor when speaking in classical Arabic, for Islamic law commands addressing people according to their understanding, with wisdom and good counsel, as stated in the Almighty's words: "Invite to the way of your Lord with wisdom and good instruction, and argue with them in a way that is best" and His saying: "and speak to people good words" and His saying: "And tell My servants to say that which is best."