Why not? First of all, why do we marry that person? For her family? Background? Religious? Money or marry her because of she is who she is?
When we love someone, it should not be restricted to their religious, if it is, then do we really love that person or actually ourselves. We loves ourselves more, that why when they are in different background, religious, career, etc, and we choose not to take a go with them, isn’t this pure selfish?
Moreover religious is something very universal, whether we are Buddhist or Christian, they teach us to respect each other, they teach us to built a better relationship between people and people, so, religious is never a problem, it is human that created it.