Perhaps government should just stop sanctioning an institution with a 50% failure rate by removing the tax incentives/benefits that come with getting married in the first place and allowing those benefits to be assigned to individuals instead?
The 50% failure rate is an example of why the government should not be defining marriage. No-fault divorce was a state idea, not the church's.
The state cannot and should not be bound by the whims of a church. I find it funny that we still consider marriage as a religious co-habitation rather than what it really is, a legal contract of partnership. If the partnership breaks, then you should be able to get out of the contract. It's that simple.