What is the ruling on someone who wishes to complete his university studies and prepare a doctoral dissertation in Sharia and Law, comparing positive law with Islamic jurisprudence in a specific issue, while he is not among the scholars deeply rooted in the Sharia sciences?

It is permissible to study man-made laws for a valid purpose, such as demonstrating the superiority of Islamic Sharia rulings and highlighting the contradictions and injustices within man-made laws, or to benefit from them in ways that do not contravene Sharia, while still detesting ruling by them and believing in their invalidity. It is a prerequisite for anyone studying them to possess a solid foundation of Islamic knowledge in Fiqh, its principles, and the objectives of Sharia, so that they can distinguish and clarify the truth and avoid error.