Why is the marriage institution failing miserably and wrecking havoc to the lives of many including christian marriages?
What is God's view and intent on the two who get married because its discouraging to the unmarried seeing that marriages once strong and founded on Christ are no more?
Marriage was instituted by God and is designed to be for life.
The external reasons cannot be narrowed down. There are so many reasons and each case is unique. What we need to do is look at the underlying reason(s). Here we find that two things are usually involved in my opinion. Selfishness and lack of commitment. Most of the time it is on the part of one, but can include both people. People often enter into marriage with the world's view of "What's in it for me" instead of the Biblical view of "putting the other person first."
Some will say that divorce is caused by people growing apart. The growing apart is a sign of a lack of commitment, because marriage takes work from day one and work through the whole life of the marriage. Marriage cannot be put on autopilot in the a similar manner that our walk with God cannot be put on autopilot. Time spent together is critical.
This is a short and by no means a comprehensive answer.
There is one statistic out there that is misleading. Stats show that the divorce rate of Christians is about the same as non-Christians. This does not factor in the number of people who live together out of wedlock that connect and separate from various partners over a lifetime. If this were factored in the stat would look quite different. This does not minimize the problem in the church, but sheds light on the fact that the church and world are not as similar as some want to proclaim they are, at least on this point.
Summary: Divorce is a human failure to be commited to the marriage covenant. Let me be clear. This failure can be on the part of only one. Thus if a person reading this has gone through divorce it may be that the divorce was the failure of your spouse and you are left hurt, but not responsible for the outcome as one cannot control the actions of another. If it was caused by your failure, then healing is available through repentance and the love and grace of God.