your view is not right, we have lots of religious believers in China. hundreds of millions.
partially Chinese are not interested in Islam is because once you marry a Muslim girl or man, you have to be a Muslim as well. the living practice of Han Chinese and Muslim is very different, for example, Han Chinese like porks, Muslim can't have any of it.
Are the Chinese more negative to Islam or Christianity. I always believed Christianity is seen more negative due to history like the Taiping Rebellion, Boxer Rebellion and Western colonialism.