Bonsai : Fei cheng hao! 非常好!
Or more simply: Hen Hao - 很好 (pronounced more like hun how), also 很棒= hen bang = wonderful! and 很不错 = great!
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The JWs in China want to act like supporters of ISIS do in western countries.
That's not an accusation that they engage in terrorism, but that they act furtively (with extreme secretism). That's because their policy of refusing military service is against Chinese state policy. (NB- they are also banned in Singapore for the same reason).
Since they act secretly, then the Chinese government is entitled to screen them.
I have no idea as to what the JWs will do in response to any further action to identify them and winkle them out, except that whatever they will do can only be a continuation of past actions.
WHY may the Chinese government want religions to register?
Judged on the past 150 years, when Christian religions acted as subversive agents of western colonialism, the Chinese state has no reason to trust any Christian religion. However, Christian religions that register and promise loyalty to China are permitted freedom to hold services.
And we may like to remember that the Taiping rebellion of the mid-nineteenth century, a rebellion that nearly toppled the Manchu Qing dynasty, was started by a Christian convert and highly praised by western missionaries, who wet themselves with joy in the expectation that China may become Christian. That rebellion failed, when the (Christian) British government gave more support to the Qing government.
Are there 100 million Christians in China?
Seriously doubted!
Lets compare China to Taiwan, where a similar ethnic mix exists, after the USA supported Nationalists were defeated and Chiang Kai Shek and the remnants of his armies fled to Taiwan.
Despite having freedom to preach and few restrictions, and in spite of members of Chiang Kai Shek's own family being Christian, the total number of Christians in Taiwan are only 3.9% of the population. Extending that percentage to the PRC would give a membership of about 50 million. But even that is likely to be an exaggerated number.
The really important aspect of the claim of 100 million, is that churches in western lands have always lied about their success in mission fields, in order to extort more donations from credulous churchgoers.
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Why should anyone worry about Christians in China?
Christianity is a pernicious superstition, the sooner it is forgotten the better for humanity.