Many doubters were taught to fear the question itself. The moment uncertainty appeared, it was named sickness, whispering, corruption, or rebellion. That language can produce panic long before any argument is evaluated. Islam deserves a better approach than fear-driven anti-thinking.
Doubt can arise from confusion, pain, curiosity, sin, pride, grief, or serious intellectual struggle. Those causes are not identical. The presence of a question therefore does not by itself tell you what kind of event you are living through. It tells you that your heart and mind have reached a point where inherited language is no longer enough.
The better Islamic response is disciplined inquiry. Ask better questions. Distinguish sources. Separate God from bad representatives of religion. Separate a difficult doctrine from a caricature of it. Tawhid does not ask for intellectual self-erasure. It asks for truthful seeking under God. Some doubts dissolve quickly. Others take work. Their existence does not prove you have already left.