Islam is covered in the science of fiqh
Iman is covered in the sciences of 'aqeedah and kalam
Ihsan is covered in the sciences of tassuwwuf and tariqah
Alternatively one can say that Islam is for the limbs, Iman for the heart and mind, and ihsan for the soul.
Each of these are subject to huqooqAllah and huqooqulibad
The Qur’an and hadith are the references for these three domains and likewise the Qur’an and hadith should be the reference points for any modern science and research.
It’s not that we do not need the stuff from the kafiroon … rather we need to do medicine, education and invention through the regulatory authority of Qur’an and hadith.
We should not create medicine in order to create multi-billion dollar organisations which exploit the masses.
We should temper education so that we encourage the learning of Islam, unsecularise the learning areas to stem from a religious basis and bring back etiquettes, manners, morals into the education arena.
We should invent but caution it with and weigh it out against our responsibility for the environment. We are capable of genetically modifying sheep, does it mean that we should do it for the sake of it?
Essentially we only need Qur’an and Hadith … the emphasis however is hidden behind the word ‘need’, which implies, to have a couple of shelves of Arabic books fulfils this criteria but rather it should be argued when that need is truly fulfilled i.e. Qur’an and hadith are fully implemented the way they were meant to be then yes this statement is true.