41 Muslim nation, military alliance.
P.S. Not all European countries are part of NATO. Yet its a functional and effective alliance.
Iran obsession of some people should not stop this NATO style alliance from being operational.It will benefit all Muslim countries.
Iran only became Islamic republic in 1979. Pakistan was legally declared Islamic republic in 1953.
Saudi Arabia has been Muslim country since the dawn of Islam.
There are better candidates for leading a Muslim military alliance than Iran.