Both China and South Korea have already forbidden church gatherings. I am not sure if the Roman Church has forbidden them in letter, but Francis has been giving his mass via videoconference. In other religions, Saudi Arabia is saying that Hajj will probably be cancelled this year. It is early enough that it probably could go on with limitations on the number of visas, screening at the points of entry, and not granting visas to every country (ie, targetting against the countries with most infections) but the likeliest possibility still seems like a full cancellation.
Of course every country (and lower political unit) takes their decisions at their own time. Shows and sports have been told to close at different dates in different places, as have been businesses (factories, restaurants, office high rises...), schools, museums, and international borders. Certainly religious gatherings and temples themselves will also be closed at different times in different places. So I'm not surprized some place still hasn't closed churches; but others definitely have.