As-Salāmu `Alaykum (السلام عليكم):
A practicing Muslim can not embrace the Vegan philosophy. The Vegan philosophy is primarily about dietary habits but Vegans embrace philosophies that are opposed
to the fundamental principals of Islam. The proper slaughtering of animals are a right
permitted by Allah. If a Muslim chooses to eat it or not meat is his right but he is unable
to say it is wrong to properly slaughter an animal outlined by Allah in the Quran and eat it by other Muslims.
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The Official definition of a Vegan and philosophy which is opposed to Islam:
"Vegetarians do not eat meat, fish, and poultry. Vegans are vegetarians who abstain from eating or using all animal products, including milk, cheese, other dairy items, eggs, wool, silk, and leather. Among the many reasons for being a vegetarian are health, ecological, and religious concerns, dislike of meat, compassion for animals, belief in non-violence, and economics."
"Veganism, or strict vegetarianism, is the conscious choice to refrain from eating or otherwise using any animals or animal-derived products. There are as many reasons to be vegan as there are vegans, but generally one chooses a vegan lifestyle for either health reasons or compassion for animals, or both."
"If you want to prevent violence toward animals, the single most effective action you can take is to go vegan. A vegan, or "strict vegetarian," is someone who avoids purchasing or consuming animal products or products tested on animals."
(This philosophy is in opposition of Islam) Allah has made fish lawful without slaughtering)
Allah has made lawful everything in the sea: (Except eel, some also include crab because
it is a scavenger and crawls on land)
Al-Ma'idah (The Table Spread) 5:96
أُحِلَّ لَكُمْ صَيْدُ الْبَحْرِ وَطَعَامُهُ مَتَاعًا لَّكُمْ وَلِلسَّيَّارَةِ وَحُرِّمَ عَلَيْكُمْ صَيْدُ الْبَرِّ مَا دُمْتُمْ حُرُمًا وَاتَّقُواْ اللّهَ الَّذِيَ إِلَيْهِ تُحْشَرُونَ (5:96)
Ohilla lakum saydu albahri wataAAamuhu mataAAan lakum walilssayyarati wahurrima AAalaykum saydu albarri ma dumtum huruman waittaqoo Allaha allathee ilayhi tuhsharoona
5:96 (Y. Ali) Lawful to you is the pursuit of water-game and its use for food,- for the benefit of yourselves and those who travel; but forbidden is the pursuit of land-game;- as long as ye are in the sacred precincts or in pilgrim garb. And fear Allah, to Whom ye shall be gathered back.
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Al-An'am (The Cattle) 6:121
وَلاَ تَأْكُلُواْ مِمَّا لَمْ يُذْكَرِ اسْمُ اللّهِ عَلَيْهِ وَإِنَّهُ لَفِسْقٌ وَإِنَّ الشَّيَاطِينَ لَيُوحُونَ إِلَى أَوْلِيَآئِهِمْ لِيُجَادِلُوكُمْ وَإِنْ أَطَعْتُمُوهُمْ إِنَّكُمْ لَمُشْرِكُونَ (6:121)
Wala takuloo mimma lam yuthkari ismu Allahi AAalayhi wainnahu lafisqun wainna alshshayateena layoohoona ila awliyaihim liyujadilookum wain ataAAtumoohum innakum lamushrikoona
6:121 (Y. Ali) Eat not of (meats) on which Allah's name hath not been pronounced: That would be impiety. But the evil ones ever inspire their friends to contend with you if ye were to obey them, ye would indeed be Pagans.
Al-Ma'idah (The Table Spread) 5:3
حُرِّمَتْ عَلَيْكُمُ الْمَيْتَةُ وَالْدَّمُ وَلَحْمُ الْخِنْزِيرِ وَمَا أُهِلَّ لِغَيْرِ اللّهِ بِهِ وَالْمُنْخَنِقَةُ وَالْمَوْقُوذَةُ وَالْمُتَرَدِّيَةُ وَالنَّطِيحَةُ وَمَا أَكَلَ السَّبُعُ إِلاَّ مَا ذَكَّيْتُمْ وَمَا ذُبِحَ عَلَى النُّصُبِ وَأَن تَسْتَقْسِمُواْ بِالأَزْلاَمِ ذَلِكُمْ فِسْقٌ الْيَوْمَ يَئِسَ الَّذِينَ كَفَرُواْ مِن دِينِكُمْ فَلاَ تَخْشَوْهُمْ وَاخْشَوْنِ الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الإِسْلاَمَ دِينًا فَمَنِ اضْطُرَّ فِي مَخْمَصَةٍ غَيْرَ مُتَجَانِفٍ لِّإِثْمٍ فَإِنَّ اللّهَ غَفُورٌ رَّحِيمٌ (5:3)
Hurrimat AAalaykumu almaytatu waalddamu walahmu alkhinzeeri wama ohilla lighayri Allahi bihi waalmunkhaniqatu waalmawqoothatu waalmutaraddiyatu waalnnateehatu wama akala alssabuAAu illa ma thakkaytum wama thubiha AAala alnnusubi waan tastaqsimoo bialazlami thalikum fisqun alyawma yaisa allatheena kafaroo min deenikum fala takhshawhum waikhshawni alyawma akmaltu lakum deenakum waatmamtu AAalaykum niAAmatee waradeetu lakumu alislama deenan famani idturra fee makhmasatin ghayra mutajanifin liithmin fainna Allaha ghafoorun raheemun
5:3 (Y. Ali) Forbidden to you (for food) are: dead meat, blood, the flesh of swine, and that on which hath been invoked the name of other than Allah. that which hath been killed by strangling, or by a violent blow, or by a headlong fall, or by being gored to death; that which hath been (partly) eaten by a wild animal; unless ye are able to slaughter it (in due form); that which is sacrificed on stone (altars); (forbidden) also is the division (of meat) by raffling with arrows: that is impiety. This day have those who reject faith given up all hope of your religion: yet fear them not but fear Me. This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion. But if any is forced by hunger, with no inclination to transgression, Allah is indeed Oft-forgiving, Most Merciful.
(Ḏabīḥah (ذَبِيْحَة) is the prescribed method of slaughtering all animals excluding fish and most sea-life per Islamic law. This method of slaughtering animals consists of using a well sharpened knife to make a swift, deep incision that cuts the front of the throat, the carotid artery, wind pipe and jugular veins but leaves the spinal cord intact.)
The primary reason that practicing Muslims that posted on this thread and stated the reason for not
eating meat was because of the lack of access to halal Ḏabīḥah meat.