If you see the nativity in a dream, then such dream shows the new features you have found in yourself you didnt know you have. The dream also shows the understanding of the real meaning of life where the most important things are the spiritual ones and definitely not the material ones.
Dream dictionary: Nativity dream meanings
…To dream about the nativity indicates that you’ve made a startling discovery about your abilities. It also notes the importance between spiritual enlightenment and inner strength, with your material wealth….