So what? What will you do with 2 billion people? How many want to move to the west for a better life?
Are those 2 billion even United and "Islamic" as you'd like them to be? The ones in UAE, Turkey seem pretty chill and western to me. Apart from the conservative leadership in some places the people have embraced capitalism and materialism.
Your mutual enemy thing only works on paper, war is not something that is always on somebody's mind.
Also Indias affairs are our own problem sort out your own problems before looking at ours. How are you guys planning to repay the recent debt?