The Chinese will ally themselves with whoever will benefit China.
Of course they would love to be the world's only superpower and will do whatever it takes to achieve this.
If faced with the overwhelming power of an American-Russian-Indian alliance, that completely disempowered Islam, they would cooperate and, if the alliance made it advantageous to them, would join the alliance.
If they considered it possible to dominate the U.S. and the rest of the world by allying themselves with the Islamic world, they would. In fact, they have been doing this.
If China can overpower the U.S., she can dominate the world. Her actions will depend on whether or not she considers this possible.
The Chinese leaders have considered the U.S. to be decadent and in irreversable decline. If anyone knows the signs of this from grim experience, it's the Chinese!
They became increasingly convinced of this during the 1990's, when Americans twice elected a psychopath to the presidency and generally applauded and laughed at his antics, which inluded purjury, rape, wag-the-dog bombing of other countries; when American political leaders sold military secrets to foreign powers, notably the Chinese! and Americans reacted with indifference; when many other signs of decline and decadence revealed themselves over and over again. One Chinese leader said, "If the American people had the moral authority they think they have, they would have thrown Clinton out."
The American reaction to the September 11 Massacre gave the Chinese reason to pause and reconsider. They are still not convinced that America can overcome her decadence and decline. They are watching carefully and waiting to see.
China's future actions depend mainly on whether or not the U.S. declines, and this depends on whether or not the American people repudiate decadence--essentially "Liberalism"--and remove "Liberal" leaders from power--or not.
If the U.S. declines, China will ally herself with Islam until she destroys the U.S. and the rest of the West, confiscates Siberia, and establishes herself as the world's only dominating power. Then she will take on Islam.
If the U.S. remains strong and powerful, China will accomodate and become cooperative with the West.