In my own personal experience I did not become a serious Christian till after I got married to an atheist.
As much as I love him it causes some serious problems in our relationship. In any marriage you have to give your parent just as much, if not more then you take. This becomes difficult if your partner has a completely different set of values then you do. Spouses tend to get upset if you abandon them every Sunday, demand that he not watch his favorite shows on tv.....
On the other hand  it is not fair for the other spouse to endure things that are completely against what their spouse believes. And those problems become even more complicated when the children arrive.
Which parent do you think a child will prefer the parent that forces them to dress up every Sunday and sit still for over an hour every Sunday, or the parent who wants them to play in the park when it is cool and the rides are not crowded?  The parent that lets them almost everything on tv or the parent that is picky about the tv they watch? 
If you have not yet married PLEASE do yourself a big favor and do not get overly attached to someone whose world view is contrary to your own. You can NOT count on changing them. Wait till after they change before you bond with them.