The article concerns conditions for the development of religiousness. One of the factors in the religious growth is a participation in the life of religious communities. Currently the Families Covenant Community „Mamre” is a very popular religious group among Catholics. Due to the fact that it is a relatively new group, in the literature we note the lack of studies attempting to verify empirically the nature of its impact. Taking it into consideration, a project has been performed whose aim was to answer if people belonging to the Families Covenant Community „Mamre” have a higher religiousness level than those who do not belong to this religious group. The hypothesis concerning the existence of differences in religiousness between those belonging and not belonging to this movement has been assumed. The study involved 110 people aged from 19 to 59 years (M=38.55, SD =11.22). Measurement of the respondents’ religiousness was taken using the Religious Meaning System Scale by D. Krok. The results obtained allowed to confirm the formulated hypothesis.