Is there any fiqh or firqa regulation authority in the world? Who gave the lisence t these four gentlemen to define fiqh? What was so special about them? Could theyvhave not made a mistake?

To say that a particular fiqh has to be followed in its entirety doesn't make sense to me. what if the imams had mixed up their opinions about particular ayah?
On the gates of hell or heaven the angels aren't going to checkbany passports. They will see whether the amaal nama is in right hand or left. And that depends on the decision of Allah.

Every human being is khalifa tul ard. Every human being is a prince. Allah's soul has been breathed into every human being. Every human being is answerable for their own deeds. There will be a group in hell who, when asked why they are in hell, will reply that because they blindly followed their predecessors.

If someone asks you about your religion. Say it is humanity. If they are not satisfied ask them about their religion and show polite interest.

Maulana rumi used to bow seven times to a christian evertime they met. If that doesn't open your eyes then good night