What is the ruling on repeatedly asking a question that involves a doubt about whether conversations in the Qur'an are transmitted verbatim, and is that considered disbelief if it is without need?

The conversations mentioned in the Qur’an are by their meanings, not by their exact wordings, and they are considered the speech of Allah because Allah spoke them. As for disbelief (kufr), what happened is not considered disbelief; because the heart did not believe in disbelief, nor was it uttered. Rather, these are questions and whisperings (waswas) caused by the desire to remove doubt, and it is advised to turn away from them.