Why do islamic states, both in their early years and today, differ from christian states in the relationship between church and state?

Islamic states foundation a religious government. Numerous Muslim nations have joined Islamic law, entirely or to some extent, into their lawful frameworks. Certain Muslim states have pronounced Islam to be their state religion in their constitutions, yet don't make a difference Islamic law in their courts. Islamic states which are not Islamic governments are typically alluded to as Islamic republics.