The word "believe" seems to have vastly different meanings to different people.
The usage of the word in Christianity roughly comes down to, "think something is true without any evidence, even in spite of contrary evidence."
The scientific usage of the word roughly comes down to, "think something is true because there is good evidence for it, and because there is no contrary evidence."
When you look at it like that, these definitions are almost exactly opposites of each other.
How are we supposed to have a meaningful conversation between the two groups when we can't even agree on the definition of the word? It's even more daunting when that word forms the basis of the religion to some extent, as it does in Christianity.