In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Shaikh Shamsuddeen Al-Afghaanee As-Salafi [rahimahullaah] said:
The books of Greek Philosophy that contained the ideas of grave and idol worship were translated into Arabic, so many of those who attributed themselves to Islam busied themselves with these books, such as the likes of Al- Faraabee (1) Ibn Sinaa Al-Hanafi (2) Naseer At- Toosee the advocator of disbelief and shirk (3) and other than them amongst those who played tricks with Islaam, just as Paul played tricks with Christianity. They were influenced by the ideas of the Greek Philosophers, such as the creed of grave worship, so they became callers to grave worship through Greek Philosophy. The practices of these people was rife within the ranks of the people of rhetoric amongst the Hanafi Maatooreediyyah (4) and the Ash’ariyyah Kullaabiyyah due to busying themselves with the Books of the Philosophers; so they were influenced by the creed of grave worship. They became callers to grave worship and callers to the creed of the Jahmiyyah at the same time, such as the likes of Taftaazaanee Al-Hanafi- the Philosopher of the Maatooreediyyah and Grave worshipers, and Jurjaanee Al-Hanafi- a caller to superstition.
Al-Faraabee said that Philosophy is more perfect than Prophet hood. Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said about him: ‘’Misguided; a disbeliever’’ Ibn Sinaa adopted his books and ideas of disbelief. [For further details concerning Al- Faraabee, See Majmoo Al-Fataawaa 2/67—86] [Dar At-Ta’aarud 1/10] [Ighaathatul Luhfaan 2/372-373].
 Ibn Sinaa
Imaam Ibnu Salaah (rahimahullaah) said about him: ‘’He was a devil amongst the human devils.’’ [See Fataawaa Ibn Salaah 1/209] [Also see: ‘Ar-Radd Alal Mantaqiyyeen’ of Shaikhul Islaam Ibn Taymiyyah 278-279] [‘Ighaathatul Luhfaan’ of Imaam Ibnul Qayyim 2/373-380] [Bidaayah Wan-Nihaayah’ of Imaam Ibn Katheer 12/43]
 Naasir At-Toosee
He was a magician and a minister of the Tartars. He rejected the ‘resurrection’. For further details, see: As-Sawaa-iq Al-Mursalah of Imaam Ibnul Qayyim (rahimahullaah) 2/790; 3/1077-1078
Followers of the Jahmi Abu Mansoor Al- Maatooreedi Al-Hanafi [For further details, see the Book of Shaikh Shamsud-deen al-Afghaanee titled: ‘Al-Maatooreediyyah’ 1/205—376]
[End of quote: An Excerpt from Juhoodu Ulamaa Al-Hanafiyyah Fee Ibtaal Aqaa’id Al-Qubooriyyeen. Vol 1. Page 19-25]
Sound Progress Has to Be Accompanied By Sound Creed
Saudi King Abdul Azeez (rahimahullaah) said:
Indeed, the progress and advancement of the Muslims is among those affairs we (pursue) – we call to it by the will of Allaah. [However] there cannot be advancement for the Muslims without a return to their religion, adherence to their sound creed and holding onto the Rope of Allaah (i.e. the Qur’aan and the Sunnah). The path towards this is clear and provided for the one who wants to follow it, and that is to single out Allaah in worship – to be free from shirk and bidah- and act on that which the religion has commanded us, for indeed there is no benefit in speech if not (accompanied) by action. [Source: Haqeeqah Manhaj Al-Mamlakah Al-Arabiyyah As-Su’oodiyyah’ page 33]
The Correct Manner In Which to Approach The Contemporary Sciences – By Imaam Abdul Azeez Bin Baaz [rahimahullaah], Imaam Muhammad Bin Saaleh Al-Uthaymeen [rahimahullaah] and Shaikh Saaleh Aala Ash-Shaikh [hafidhahullaah]
Shaikh Saaleh Aala Ash-Shaikh [hafidhahullaah] said:
The Messenger [sallal laahu alayhi wasallam] said: Verily, the creation of each of you is brought together in his mother’s womb for forty days as a drop [of water, semen], then he is a clot for a similar period, then a morsel for a similar period…. [An-Nawawi’s Forty Hadeeth. Hadeeth 4]
It is well known that during that era, the Sahaabah did not know these stages [of development of the human being in the womb] through experimental knowledge, vision [i.e. by way of the naked eye] or other than that; rather it was simply [a statememt of the Prophet] which they [believed and affirmed]. They were scholars by way of the revelation sent down to the Prophet [sallal laahu alayhi wasallam] and not by way of experimentation [examination].
[Sharh Al-Arba’een. Hadeeth 4]
Imaam Muhammad Bin Saaleh Al-Uthaymeen [rahimahullaah] said:
We do not say: “We do not give consideration to anything stated by the people in the subject matter regarding medicine, astronomy and the celestial bodies”; however, we do not accept everything they say. If what they say opposes the Book and the [authentic] Sunnah, then indeed we do not accept their statements; [rather] we take [i.e. believe and affirm without any doubt] that which is conveyed in the Book and the [authentic] Sunnah, and we say, ‘An era will come in which the people will bear witness to the falsity of those statements of theirs – at present – that are in opposition to the Book and [authentic] Sunnah and [bear witness] to the soundness of that which has been conveyed in the Book and the [authentic] Sunnah. [An excerpt from the ‘Explanation of Bulooghul Maraam’ Vol 1. page 130]
Imaam Abdul Azeez Bin Baaz [rahimahullaah] said:
Indeed, that which is stated by the astronomers about the celestial bodies, their sizes and the distance between them, and that which is said about the earth [i.e. by the geologists etc] is categorized into three affairs: [a] That which is backed by the sound knowledge-based proofs [i.e. the Sharee’ah], therefore it is accepted. [b] That which the knowledge-based proofs [i.e. the sharee’ah] declares to be false, therefore it is rejected. [c] That which there is no proof to either accept or reject it, therefore it is unproven until a person from the people of knowledge [i.e. upright scholars of Ahlus Sunnah] examines it [i.e. examines what it indicates based on the Book and Sunnah] to show whether it should be accepted or rejected. As for accepting it without [sound] investigation and observation, but merely accepting it by blindly following them [i.e. the astronomers, geologists etc], then this is impermissible because of the numerous mistakes that occur as a result of that, and speaking -without knowledge – about Allaah and that which He has created [i.e. the entire universe and all that is within it].
[An Excerpts from ‘Al-Adillah An-Naqliyyah Wal-Hissiyyah Alaa Imkaanis Su’ood Ilal Kawaakib Wa Alaa Jarayaan Ash-Shams Wal-Qamar Wa Sukoon Al-Ard’ page 74. slightly paraphrased]