This is a very important issue that should have been discussed and agreed upon before you married a non-Muslim and most especially before you have children. This is why it is so important when any two faiths join together in marriage. This is a tough question, so much depends on how much love and respect is in your marriage and who in willing to concede. Someone will have to concede wether it's you or your wife. It would be extremely difficult to raise your children with two beliefs trying to please both parents. It is pressure on the child as well as running the risk that she could choose to believe nothing. Maybe you could try to talk to your wife and show her all the things that bring Christianity to Islam in a logical way, and pray that she sees the connection and will choose to become Muslim as well. Good luck to you.