It's kind of difficult to tell someone to "follow Christ" simply because people only seek supernatural beings and help when they feel they've need it in their life.
as long as they think that they don't need any divine intervention, i think it'll be difficult to simply tell them about it.
Plus, maybe there's something your spouse don't like about the way you approach him or her when it comes to religion.
I think the best way for you or anyone to convince people that they need enhancement of any sort is to be a really great example. If they see you as a better person, maybe they'd want to be like you.