The one who does not pray and does not fast is a disbeliever

Question: I am a student studying away from my family and living in a dormitory. The place where I study is about one hundred and fifty kilometers from my family, and I visit them on Thursdays and Fridays every week. Should my prayers be shortened or performed in full on the two days I spend with my family, and on the five days I spend in the dormitory? Please advise us, may Allah reward you with good.

Answer: As for the days you spend in the dormitory, the five days, and the two days with your family, it is obligatory for you to perform the prayers in full. As for the journey between them, it is permissible for you to shorten the four-rak'ah prayers and it is permissible for you to combine the two prayers in the time of one of them, either bringing it forward or delaying it. The dispensation for combining and shortening applies only during the journey. As for residing in the city of study for five days, and your residence with your parents in your homeland, it is obligatory for you to perform the prayers in full.
The Sharifah all states that such a person is one of ill fortune. What is to be done?
And I am his son, twenty years old, and for years, by various means, I have tried to convince him that the people in the village want him in the mosque to pray with them or for them, but he ignores it and is lazy about performing this divine right.And he repeats, saying: That most of the worshippers in this time are open sinners and hypocrites.And now some men say to me: If your father dies, who will wash him and pray over him while he is in this state? Guide us to what is obligatory for me regarding this father of mine, and what is the ruling if he dies in this state?

Answer: The one mentioned, who has knowledge but does not pray, does not fast, and does not act according to the rulings of the religion, is misguided, and I seek refuge in Allah from that. His misguidance is clear if he abandons prayer intentionally. Abandoning prayer intentionally is disbelief according to the correct view, even if he does not deny its obligation. As for if he denies its obligation, he is a disbeliever by the consensus of the Muslims.

The result: That this one mentioned by the questioner, who does not pray and does not fast, is a disbeliever if he denies the obligation of prayer and considers it not obligatory; then there is no doubt in his disbelief. And if he acknowledges its obligation but abandons it out of laziness, then there is a difference of opinion among the scholars, and the correct view is that he is a disbeliever.
But your duty, O son, is to advise him, and not to despair of his guidance, perhaps Allah will guide him through your hands. So repeat the advice to him. If you see from him persistence in his state and refusal to accept the advice, then you must separate from him and isolate him. There is no harm in being kind to him in what he needs of financial maintenance and worldly kindness; rather, it is obligatory for you to be kind to him and maintain ties with him. But do not sit with him or live with him unless he needs you, while advising him and pressing him, perhaps Allah will guide him.
As for the issue if he dies in this state, he dies while he is a disbeliever—and I seek refuge in Allah from that—the Muslim does not take charge of the disbeliever, but rather his disbelieving relatives take charge of him.Allah the Exalted said: [Al-Mumtahanah: 13], so his disbelieving relatives take charge of him if he has disbelieving relatives. And if he does not have disbelieving relatives, then he is buried far from the Muslim cemetery, he is covered with earth, and he is not washed and no prayer is performed over him. Rather, he is buried in his clothes in a burial place separate from the Muslim cemetery, by way of covering his body so that people are not harmed by it; and because the Prophet (peace and blessings be upon him) threw the slain of Badr into the well, it is necessary that he be covered and not buried in the Muslim cemeteries.