That''s a rough one. Many people feel that having faith in their life helps them make the right decisions and stay away from people and activitiies that are not healthy. You mentioned a Christian school, so I will assume that your wife is involved with a Christian church. Christianity teaches people to love each other and to NOT be judgmental. However, many people, especially those new to the church, will swing too far one way and become judgmental, "holier than thou" and try to indoctrinate everybody around them with their new faith. This is not the way that Christian faith and practices are suppose to be.
You and your wife need to communicate about the direction of your marriage. Some people use their faith to withdraw from the world. Christians are supposed to be out among everybody; the way Jesus was - inspiring people with their good behavior, good works and by setting an example. Going to a Christian school can help your daughter learn to make the right decisions and live a faith-based life.
That said, this is one of the life changes that happens in a marriage that can end up being a deal breaker. If you are not interested in becoming a Christian or following that path, then you and your wife need to figure out how to navigate the step chapter of your marriage. Couples counseling could help you decide how to proceed. I wish you the best.