Language is an important component of intentional acts and behavior of people, individual or social. In the strict sense there is no "religious language" and it cannot be sought in the set of natural or artificial languages. The religious man speaks Polish or German, or even reading the Bible in the original languages we meet with natural languages, the use of which is, in this case, only religious. The term "religious language" suggests a religious use of language, as determined by the situational context. So one can determine the religious language as the language used by man in a religious situation. A special place for the formation of a religious vernacular language is preaching and homiletics. It should be noted that it is characterized by great uncertainty of proper and understandable talk about God. In advising contemporary preachers the need to adopt an attitude of understanding the problems of the listeners and to give a testimony of faith is stressed. Along with the formulation of formation postulates, new proposals appeared to return to the art of speaking, rhetoric. It is difficult to overestimate the role of religious language in the spiritual development of individuals and communities of believers. Kerygma is a task entrusted by Christ to the Apostles, which is not only looking for new angles and interesting speech, but the proclamation of the message. It's not just information, but the stimulation of living faith, which takes its fullness in Christ.