A behavior change initiative with respect to contraceptive and family planning methods flourished in a religious context of the Church of the Assemblies of God in the Municipality of Abomey-Calavi in ​​the Republic of Benin. What mechanisms can explain such efficiency in this religious context which is initially very reluctant or even hostile to such action ? The objective of this research is to analyze the influence of the communication strategy used which facilitated the adoption by Calavi DA devotees of modern methods of contraception. Through a mixed approach, 142 units were taken, targeted by reasoned choice sampling techniques and whose data were collected by sampling, interview and participant observation techniques.It can be noted that the influence of the communication strategy used by the DAs for the adoption by Calavi devotees of modern family planning methods was facilitated by two factors. It is about the choice of the appropriate messages and channels having reversed the determinants of failing behaviors internal to the Church of the DA and the social relations of influence established within the Church facilitated by the internal organization within the Church. Church. It is therefore the communicational flow of multilevel influence was developed from social relations within the Church of the Assemblies of God in the Municipality of Abomey-Calavi with as main actor religious leaders at various levels in a double vertical and horizontal perspective.