If Ceasar says it is illegal to gather and preach the name of Jesus and shuts down all churches- We gather and preach the name of Jesus
There is a fine line, and it’s not always clear when the line has been crossed-
In China- it’s illegal for people to gather in homes and teach Christianity- but they do so anyways- because God’s laws are higher than any government’s laws that violate His laws-
In the case you mention about China...we worship the living God...anywhere! In those cases we dare to be a Daniel and and face the lions’ dens is we have to.