Many wonderful ladies find themselves in the unfortunate situation of having a husband who isn't a Christian. It's a sad situation which causes, in many cases, great anguish of heart and presents a tremendous challenge to the  Christian's faith. However, it is not an impossible situation for the one who has the desire to cope with it and the faith to do so. Perhaps the following suggestions will be helpful.
1. Don't give up! It was just  to such a situation as this that Paul wrote, "For what knowest thou, O wife, whether thou shalt save thy husband?" (1 Cor. 7:16) Paul didn't recommend giving up and neither do I. Surrender to his unfaithfulness is not the  answer. It will do nothing but drag you into his lost state and erect barriers which might well be the doom of both of you.
2. Be a Christian wife. Learn what the Bible teaches in 1 Peter 3:1-4 and Titus 2:4,5 and then make a conscious, determined effort to practice it. What he needs more than anything else at this time is the gospel according to you.
3. Be an active part of the church. Many  husbands are   unreachable because the wife demonstrates in her life that the church is unimportant.
4. Speak well of the church. Criticism of the church will have a negative effect. Emphasis on the bad side will blind him to the good side and the divine side. Any congregation has a good side. Look for it and talk it up!