Americans can bring not only most of European countries, but also Korea, Japan, Australia and several other rich/powerful countries into American geopolitical initiatives. What do the Muslim countries do? This thread can show you the divisions; the most important contributors to this conflict would be the GCC Arabs and how many GCC PDF Members are even in this thread??
BTW, if we are talking about 'unity' in various blocks then I believe the Latinos and the Africans are even less united then the Muslim countries/communities; we don't hear about them because they are not geographically hugging the global rich North like the Muslim countries do. At least in case of Muslim countries, on the 'street' level, there is even more unity right now than it was during the Hezbollah-Israel war.
The main culprits for the Muslim lack of a coherent response are the Saudis! For short term gains/peace, they are willing to be Israel's subjugates on long term basis.