The following research sought to examine the relationship between an individual's performance of religious duties and its impact upon his or her level of marital satisfaction and children supervision. Findings in this connection can help strengthen families. Six hundred and sixty heterosexual couples from Tehran were studied using multistage cluster sampling. Information regarding religious duties and marital satisfaction was collected using the researcher's prepared questionnaire, and ENRICH marital satisfaction scale. The results showed that heterosexual couples who observe religious beliefs and perform religious duties (like participation in religious rituals and ceremonies) have a higher rate of marital satisfaction, and have suitable children supervision. Thus, there is a significant correlation between performing religious duties and marital satisfaction. Considering the relation between performing religious duties and nine subscales of marital satisfaction and children supervision questionnaire, Communication Parenting and Religious Orientation account for the highest rate of performing religious duties, and Sexual Relationship accounts for the lowest rate of performing religious duties. Thus, with the increase in religiosity and performance of religious duties, marital satisfaction rate will increase, and vice versa. However, those who perform religious duties have suitable children supervision, so they have good relationship with their family. It can be concluded that religiosity develops the grounds for marital commitment and child-rearing.