Holiday Religious Displays on Common Area

During the last several Christmas/Hannakah seasons, residents have placed religious displays on common area without ARC or Board permission. This year a complaint was made as to whether the Board should allow any religious symbols on common area. Our attorney's opinion was that the Board could allow it as long as they did not spend HOA money on only one religion, i.e., nativity scene. Our CC&Rs and By-laws do not address this issue specifically.

Since this issue will come up again this year, I was wondering if any other HOA has dealt with this matter and how.

Thanks for your help.