The purpose of the present study was to provide a model for marital satisfaction based on adult attachment styles, attachment styles to God, and trust in God in married men and women in Tehran. The research method was of a fundamental type, which according to the data collection method, was placed in the group of descriptive-correlational research and was carried out using the structural equation modeling method. The research population included all married men and women of Tehran city in the north, south, east, west, and center regions, from which 773 people were selected using the multi-stage cluster sampling method. The results of data analysis using partial least squares showed that adult attachment styles and trust in God lead directly and indirectly to marital satisfaction. Also, the trust in God variable has a partial mediating role in the relationship between styles of attachment to God and marital satisfaction, and this mediating role was more significant in women than in men. In addition to these, other direct and indirect paths (mediator, moderator, moderated mediator) leading to the variables of marital satisfaction, trust in God, attachment styles of adults, and attachment styles to God, were analyzed by considering important variables such as gender, age, education and duration of marriage. Reliability and convergent and divergent validity of the variables were investigated using composite reliability, average variance extracted, and heterotrait-monotrait ratio (HTMT). The model had adequate reliability and construct validity. Also, the data had acceptable fit indices and the variables were sufficiently independent.