In the realm of this scientific article we have examined the prevention policy of religious proselytism by means of detailed analysis of some European international acts. The purpose of this study consists in the obtaining of a profound knowledge in the area of prevention policy of the abusive religious proselytism. The problem of improper proselytism prevention was studied from the clarification of some sensitive aspects of the religious freedom. More over, we have demonstrated by means of historical documents of a great importance that a good proselytism and an improper proselytism are different in function of their method and intensity of appearance, as a result, in the realm of an improper proselytism there are applied aggressive and abusive measures, this form of proselytism contains a major risk of expansion and can be extended with a risk for national or even international security being transformed in the religious terrorism In order to formulate clear and exhaustive answers we have consulted the most famous ECHR case law and have learned scientific results of the highly regarded authors in the domain. As a result, we have formulated some conclusions which, in our opinion, will contribute substantially to the interpretation of the concept of religious freedom in the modern penal doctrine, as well as of the phenomenon of the abusive proselytism in the criminological science.