There are many different denominations of Christians. They all believe in different ways. Some are only slightly different and some are vastly different in beliefs. You say a Marriage Vow, in this case it is a Vow made to God that you will be with this person until you are separated from them in death. Getting divorced is going back on that vow, that solemn promise before God. In the Bible there is a reason for divorce and that is if the spouse was unfaithful, meaning that if he or she slept with another person while married then you could divorce or stay.

Yes, Christians do not like the idea of a divorce and so some churches will not carry out a divorce as they believe it is a sin to break the vow you have given to god