Would china allow a USA christian ceremony like louie gigleo's passion one day in the bird nest?

Generally speaking, such kind of ceremony there, but for more detail I still suggested to ask the staff of Bird Nest and their phone number is (010)84373008.
For religious ceremony, Chinese government has some restrictions and you may need to get a permi before you hold.

Thank you Bruce for the information on the nest it was very helpful. If you have any more information please send E=mail