I pray you are well.
If a Muslim thinks to himself that he had or might have had 'respect' or 'reverence' (in the mind or verbally) for other false beliefs/religions.
Later, he realises that it was doubts and that he didn't have any respect or reverence (in the mind or verbally) for other false beliefs/religions other than worldly respect e.g. leaving the false religions to do what ever they want, not interfering, respecting their privacy etc.
Does thinking in the first place that he had or might have had respect or reverence(in the mind or verbally) for other beliefs/religions, and later, he realises it was doubts and that he didn't have any respect or reverence for the false beliefs other than worldly respect, make him a kaafir?
الجواب وبالله التوفيق
According to a hadithin Saheeyain(Bukhariand Muslim), ‘Allah Subhanahu Wa Ta‘ala forgives them for thoughts that pass through their hearts (in form of waswasahi.e. suspicions), as long as one does not utter it from their tongue or act upon it’.
A person does not become kafir(disbeliever) due to a waswasah. In fact it is a pure indication of one’s eeman(faith) to condemn it, not give it any value in one’s heart, and not mention it with one’s tongue. (Meanings of a hadith)
واللہ اعلم بالصواب