For non-Christian couples who are planning to marry in Hong Kong and are looking for a church which does not require Christian affiliation, here is a choice. I just learned that this "church" is now owned by the Hong Kong Academy for Performing Arts (HKAPA) and hence does not belong to any religious organisation (it might be a good place for UU (and Sunday Assembly) services too!):
Bethanie Chapel 伯大尼小教堂
139, Pok Fu Lam Road, Hong Kong Island
香港薄扶林道139號
Tel: 2584 8918
HKAPA Bethanie Chapel
HKAPA Venue Hire
Wiki: Bethanie ChapelChinese language (ESDlife)