What is the ruling on abandoning Islamic jurisprudence (fiqh) and adopting man-made law, and does Islamic jurisprudence differ from Islamic Sharia?

The Shari'a and the Divine Law, to which Islamic Fiqh is appended, have three meanings in common understanding: 1. The Revealed Law: This is what is authentically established from the Messenger through the Qur'an and Sunnah, and it is obligatory for the entire Ummah to follow it. Whoever deviates from it commits an act of disbelief (kufr). 2. The Interpreted Law: This comprises rulings derived from the scholars' ijtihad (independent reasoning). It is permissible to follow the imams in this regard, without being obligated to adhere to the opinion of a specific imam. 3. The Altered Law: This includes fabricated hadiths, distorted interpretations, and innovations (bid'ah). It also encompasses ruling by other than what Allah has revealed, and it is not permissible to follow it.

Whoever rules by man-made laws and abandons Islamic Law, out of disdain for it or believing it to be superior, is a disbeliever.

As for the difference between Shari'a and Fiqh, Fiqh, in its technical sense, is the knowledge of practical rulings derived from their detailed evidence. It is more specific than Shari'a, which encompasses beliefs, ethics, conduct, and everything that Allah has revealed.