A popular song: Imagine there's no countries It isn't hard to do Nothing to kill or die for And no religion, too
The CCP is simply following a core tenant of communism. From the perspective of the ideology, they are freeing people from religion.
A much more important quote, a warning about accepting new ideas that too few heed today as always: “Let us keep our minds open, by all means, as long as that means keeping our sense of perspective and seeking an understanding of the forces which mould the world. But don’t keep your minds so open that your brains fall out! There are still things in this world which are true and things which are false; acts which are right and acts which are wrong, even if there are statesmen who hide their designs under the cloak of high-sounding phrases.”. — Walter Kotschnig November 8, 1939