Are the thoughts and whispers related to the essence and attributes of God, and the doubts about the Quranic verses, which are met with seeking refuge [in God] and rejection, considered apostasy and disbelief?

Disliking the whispers that Satan casts into the heart does no harm and does not necessitate disbelief (kufr) or apostasy (riddah); rather, it is a sign of faith. If a Muslim experiences such whispers, he should turn away from them and repel them by seeking refuge in Allah and ceasing to dwell on them, saying, "I believe in Allah," or saying: "He is the First and the Last, the Manifest and the Hidden, and He is, of all things, Knowing."