English summary: In Christian language usage, terms such as baptism, church or belief are of central significance. They go back to the days of the New Testament. On the basis of the Pauline Letters, i.e. the oldest of the New Testament scriptures, the author identifies the usage of such terms and examines them from an historical semantic perspective. He thereby focuses on the Pauline use of the term 'pistis' and its derivatives, which he examines...