Then you are saying islam is wrong and inferior to the non-muslim system. So why should any of us continue to be muslims?
This doesn't mean that Islam is wrong, but when you see that countries with full scale sharia law are the places with the least amount of tourists and foreign investment, then you should ask yourself some questions.
Sharia law worked extremely well during the 7th century all the way to the 17th century, but the world that we live in today is completely different from the age of isolationism, and so all countries (not only muslims) changed their system in order to prosper.
Muslim countries are not in power to decide which system they use, but the great powers are the ones who decide the rules.
Religion is on a decline world-wide including the Muslim world. Even wahhabi KSA is becoming more liberal. As more and more young people pick up new ideas from tiktok and social media the decline will accelerate.
It is not about the percentage of people who no longer practice Islam, but it's about the people who are in power.
Look at Iran, people are less practicing than the previous generations, but the country is extremely conservative compared to pre 1979 Iran where people were more religious but pretty much liberal.
Another example is Turkey, Ataturk (First president of Turkey) secularized the country when 99% of turks were muslims but now Turkey is coming back to it's islamic roots thanks to Erdogan even though most young turks (25-) are not religious (even though a lot still believe in Allah).