According to Pew Research, Hindus have the highest rate of marriage and the lowest rate of divorce.
When the survey breaks down the various religious groups by marital status, the findings show that Hindus (78%) and Mormons (71%) are the most likely to be married. These two traditions, along with members of evangelical churches, also have the lowest rates of never-married members. Hindus also have the lowest divorce rate of any group; only 5% have been divorced.
So, apparently converting to Hinduism is a great way of assuring you have a long and happy marriage.