There are only three ways an unequal marriage can turn out, (and by unequal I am willing to stretch a point and include genuine, warm Christians who want to marry an in-name-only Christian, or someone very, very far behind them in Christian experience and growth):
In order to be more in sync with your spouse, the Christian will have to push Christ to the margins of his or her life. This may not involve actually repudiating the faith, but in matters such as devotional life, hospitality to believers (small group meetings, emergency hosting of people in need), missionary support, tithing, raising children in the faith, fellowship with other believers—those things will have to be minimized or avoided in order to preserve peace in the home.
Alternatively, if the believer in the marriage holds on to a robust Christian life and practice, the non-believing PARTNER will have to be marginalized. If he or she can’t understand the point of Bible study and prayer, or missions trips, or hospitality, then he or she can’t or won’t participate alongside the believing spouse in those activities. The deep unity and oneness of a marriage cannot flourish when one partner cannot fully participate in the other person’s most important commitments.
So either the marriage experiences stress and breaks up; or it experiences stress and stays together, achieving some kind of truce that involves one spouse or the other capitulating in some areas, but which leaves both parties feeling lonely and unhappy.
Does this sound like the kind of marriage you want?