What is the ruling on one who hesitates to declare disbelievers as disbelievers?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: There are those who hesitate to declare disbelievers as disbelievers, and they say, "They are our brothers in humanity," or "They are from the people of the heavenly religions." What is their ruling?

Answer:
If he is ignorant, it should be explained to him that this is a serious matter and it is obligatory to believe in their disbelief. But if he is knowledgeable and knows that this is disbelief, may Allah protect us from it, then he has apostatized from the religion of Islam. This is because one who does not declare a disbeliever to be a disbeliever is a disbeliever just like him. This is one of the nullifiers of Islam, and it is mentioned in the ten nullifiers of Islam that Shaykh Muhammad ibn 'Abd al-Wahhab mentioned: the one who does not declare a disbeliever to be a disbeliever. Yes.