I got in my older chariot today, named Saturn, and dashed around the American Polis of Machesney Park, Illinois. I always love it whenever work or pleasure takes me to meet new people, see new places, and experience new things. During my outing, I happened to look on my phone and saw that someone I am connected to on Facebook, and who follows the old Gods like me, asked what they should do if their significant other is or wants to be a Christian. The person cited the many centuries of persecution that we have faced at the hands of the Christian church as a point of contentment. I thought about replying with a short comment through my phone, but later concluded that this question is something that, I think, requires a good, thought out response.
Perhaps I should start with the time that my wife and I first met and started living together. She was Wiccan at the time, and while I entertained Paganism and practiced Witchcraft, I was still a Christian theologically. That was my only view of deity. I would invoke Jesus, Mary and St. Michael, for instance, in my spells, and read the bible for incantations like Psalms. My wife, on the other hand, had nothing to do with any of it. Later on, through strong spiritual experiences, we both became the same pre-Christian religion, that being Hellenic Polytheism. Fortunately, the theological divide was very short lived. However, our love for one another never dissipated because I was Christian. The strength of a relationship is found in the bonds of commonality rather than the divisions of beliefs. In other words, if you have more in common with the person than the opposite, you shouldn't have a problem.
If your significant other is Christian, I would simply say this. Start by letting them have the same religious freedom that we demand for ourselves. Let them believe and worship however they want. So long as they are not disrespecting you or interfering with your own religious freedom, let them have their space the same as you would in any other situation that requires space. I've seen many couples who are Pagan/Christian and get along, apparently, just fine. You should also keep in mind that while it's true that the Christian church has persecuted and destroyed us for centuries, your significant other alone didn't have anything to do with that. It would be unjust to charge them with a crime they have not committed.
However, the real problem may come if you have children with them. Anyone who is devoted to their religion, will likely want to raise their children in it as well. You're going to want to teach them ancient values and beliefs, and your significant other will want to teach them normally opposing ones. So before you create children, perhaps you should make sure you've worked out a compromise that can work for both of you. If you just jump into childbearing without first establishing an understanding, it will lead to serious conflict, most likely. You might even end up finding that the best course for both of you is to not have children at all.
In the Goodness of the Gods,