Marriages on the Rocks

When I hear about marriages between unequally yoked spouses or marriages between a pair of unbelieving spouses being "on the rocks," it comes as no surprise. Without Christ as the foundation for this kind of relationship, the union between one man and one woman that becomes so intimate that Jesus declares the two united to be "no longer two but one," serious trouble is almost always bound to occur. There are exceptions, of course, but even these exceptions must be attributed to the grace of God - perhaps He is using these "successful" pagan marriages to raise up godly children. But I can't become proud and glory in the Lord that Christian marriages are thriving; the sad fact is that, as a whole, they are not. Divorce rates among professing Christians are as high as those of pagans. How is this possible?