In this work, what is the Catholic sect, which is one of the basic Christian sects, is handled by taking Mersin Latin Italian Catholic Church as the center. The foundation, history and development of this church, the principles of belief of the church community, the rituals that take place here; How and when these are realized constitute the main subject of our study.

With the data collected, we aim to get to know the Catholic Church community with which we live together in the same geography. We are of the opinion that if we can achieve our goal, we can learn more about this religion and its members. In addition, we do not think that "tolerance", which is the common denominator of religions, would be of little use without information.

The differences of our study from other works on this subject; The fact that almost all of our sources are based on works prepared by Catholic Christians and that the History of Religions was written in line with the principle of objectivity, which is one of the most important methods of the Phenomenology of Religion.

The obtained information, documents and data were evaluated using the history, phenomenological and comparative methods.

It is understood that all the rituals adopted and practiced by the Church are not very different from those of other Christians of the Catholic Faith, and even these rituals are almost identical.