A woman died and we do not know whether she was a Muslim or a disbeliever, so what do we do?

The Shaykh : The ruling we are in a position to issue is that if she publicly declared her Islam, as they say, and her life was conducted in accordance with this Islam, then she is to be buried in the Muslim cemeteries. They all stated that she did not pray. Her son recently said that she went on 'Umrah to visit her sister, which indicates her permission to go on 'Umrah for the purpose of seeing her sister.
Abu Layla : Her daughter.

The Shaykh : Yes, her daughter. My answer is that if her life was based on her Islam, she is to be buried in the Muslim cemeteries, and it is not permissible for her to be buried in the Christian cemeteries. However, if her life was based on the fact that this was merely a word she said, and one does not know what personal motives led her to convert or to register herself as a Muslim—and there are many incidents of this kind that are not hidden from anyone—then this declaration has no value, because this is a statement not accompanied by action, as stated in the Noble Qur'an: . I asked her son, and he said she used to go to the church on Sundays. He gave a cautious answer, saying, "I did not see her." Therefore, you should gather and review how her life was. If it is predominant in her life that she was a Muslim, she is to be buried with the Muslims; otherwise, with the Christians.