The ruling on the fasting of one who does not pray except in Ramadan

Question: What is the ruling on one who does not pray except in Ramadan, or perhaps even fasts but does not pray?

Answer: Whoever is ruled to be a disbeliever, his deeds are invalidated. Allah the Exalted said: [Al-An'am: 88], and He said: [Al-Ma'idah: 5]. A group of scholars held that he does not commit major shirk (associating partners with Allah) if he acknowledges the obligation, but he becomes a disbeliever by minor shirk, and his deed is uglier and more heinous than the deed of the fornicator and the thief and the like. Nevertheless, his fasting is valid, and his Hajj (major pilgrimage) is valid with them if he performs them in a lawful manner, but his crime is failing to maintain the prayer, and he is in great danger of falling into major shirk according to a group of scholars.
Some of them reported the opinion of the majority that he does not commit major shirk if he abandons it out of laziness and negligence, but rather he has thereby committed minor shirk, a great crime, and a heinous evil greater than fornication, theft, and undutifulness to parents, and greater than drinking intoxicants, may Allah keep us safe.
But the correct and true opinion among the scholars' statements is that he commits major shirk, may Allah keep us safe, due to the aforementioned evidence from the Shari'ah (Islamic sacred law). So whoever fasts while not praying has no fasting and no Hajj.