Well, besides the fact that both religion seem to share the very basic divine appreciation for compassion and selflessness, Buddhism and Christianity seem to share a basic appreciation of symbolism and deities. Well, at least in certain sects of both religions. In Christianity, there's only 1 god but there's Jesus, the holy father, the holy spirit and a whole pantheon of saints and angels. The same can be said of Buddhism with the pantheon of yidams, Dharma Protectors, Bodhisattvas, Arhats, Dakas and Dakinis.
Symbolism of the divine as exemplified in beliefs of a pantheon. However, the worship of the pantheon takes on a very divergent pattern in both religions. Christianity worships the pantheon as external beings to aid one's communion with God. Meanwhile, in Buddhism, the Buddha, Yidam and so forth are to be worshiped and meditated as both an external and internal being. This is to realize our Buddha potential within us. Of course this is grossly simplified because the highlight is common ground of both religions.