According to the Church Leaders Intelligence Report,
A study published in the June 2008 Journal of Marriage and Family found that strong faith in God by itself won’t protect against marital infidelity. But a study by Fuller Seminary researchers David Atkins and Deborah Kessel found that regular church attendance does make a difference. People who rarely attend services are four times more likely to have an affair than those who attend more often. Frequent churchgoers hear sermons about the moral aspect of marital infidelity and are likely to practice what is preached. Other activities such as prayer do not make a statistical difference in marital faithfulness.