I think Western culture, not Christianity in and of itself, has made us fear death, which seems quite silly when you think about it. This hasn't been the case in Western cultures until quite recently, moreover. The more we fear death, the more we see things like mediums or people whose minds may be open to things which make some uncomfortable or seem disconcerting. Yet there are people who see things some do not, cannot or will not. Even within the history of the Christian faith itself, we have mystics who have seen visions and spoken to people who had left this Earthly life - including Jesus himself.
There are mysteries of the Christian faith which we cannot explain. It goes to follow there are many mysteries in the universe that humans cannot explain, at least not yet.
I know that there are numerous aspects of paganism which were incorporated into Christian practices in an effort to convert peoples from indigenous faiths. So I feel free to acknowledge them. 'El dia de los muertos' for example. I never celebrated 'Halloween' except as el dia de los muertos.
And it's a pagan holiday, essentially when the portal between the living and dead is open.
I don't see how this affects my faith as a Christian, however, anymore than say, acknowledging that Jesus may have married a woman and fathered children whilst he was alive on Earth.