It would be quite messy for sure! I have seen some Muslims showing their frustration for not having a country who would speak for them. They argue that a Muslim-dominant nation would not only help stopping any western invasions, but also help Muslims to progress in science, technology and education. Actually, I do agree with them. I, however, also think that there are some negative issues which might not be good for any sides. Lets discuss those negative issues.
Religious War would be eminent
This is the first thing came into my mind. You might argue that we are already in a religious war, as Muslim countries facing constant threats from Christian dominant nations like USA and Russia. But, a powerful Muslim nation would take this issue to another level. The world would become a hell where deaths of innocents would rise to millions. We all know how territorial Muslims are, and Christians and Jews are no different. War would take place for silly things.
Globalization would be impossible
Whether you agree or not, globalization is important to progress and survive as a human species. Now, if we give Muslims and Christians more reasons to be conservative, then you know the consequences already. A influential Muslim nation would increase the nationalism of Muslims to a level where they would not think twice to attack other countries. For instance, USA as a dominant christian nation is currently involved in 7 different unnecessary foreign interventions.
Other small countries would be in constant trouble.
Small countries might find the balancing of relationship quite difficult. For instance, If a neutral country do any business dealings with one group, then you can imagine how the other group would put pressure on that country. Neutral countries would be in constant fear of losing trust of Muslims or Christians, and making enemies in the process for no apparent reasons.
Scientific discoveries would take more time
In case you do not know, millions of Muslim students are doing research in Europe, Canada and Australia. They are enriching our understanding of science and technology. If you somehow create a world where scientific research becomes a political war place, then this globalization of research would not happen.
