Does disbelief occur in the following situations: laughing upon hearing mistakes in Al-Fatiha, or placing one's foot next to papers containing the name of Allah, or placing religious books beneath others, or placing a book of Fiqh or Tawhid on the ground, or turning one's back to the Qiblah while sitting, or greeting and smiling at a non-Muslim female restaurant worker, or placing a bag containing a mobile phone with Qur'an and supplications near one's feet in the car, or walking near small paper scraps that might contain the name of Allah, or stepping on them?

The questioner should ease her mind and avoid artificiality and delusions stemming from obsessive whispers (waswas), the best cure for which is to ignore them. What she mentioned is neither disbelief nor mockery of religion; rather, it is from waswas. Therefore, being overcome with laughter or a smile due to her sister's mistake is not considered mockery. Merely greeting a non-Muslim woman or returning her greeting is not considered showing allegiance. Smiling in the face of a peaceful non-Muslim, being kind to them, and showing them courtesy is permissible. Placing books of Tawhid (monotheism) and Fiqh (jurisprudence) on clean ground is fine, as is merely placing one's foot next to something that contains the name of Allah, or sitting with one's back to the Qibla, or placing a mobile phone containing the Qur'an near one's feet. Walking near respected written papers is also permissible. She must ignore these thoughts, which are merely delusions.