Roman Catholic AnswerMystery is a word used to denote the sacraments in the Catholic faith. If that is what you are talking about, there are seven sacraments.
Roman Catholic AnswerIn the Eastern Church all three sacraments of initiation are given to an infant at the same time. In the Latin Rite, Baptism is given to an infant, the Most Holy Eucharist at about seven years of age, and confirmation later.
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The Catholic Church takes its origin from Judaism and many, if not all, of the Seven Sacraments of the Catholic Church have roots in Judaic practices and Scripture.
Baptism, Eucharist, reconciliation, confirmation, marriage, anointing of sick, and holy orders, are the Sacraments you have meet to become Catholic.
If you are still young, you can attend classes called CCD. If you are in adulthood, most Catholic churches offer RCIA (The Rite of Christian Initiation of Adults) classes which take you through the main sacraments.
sacraments
Baptism.
Roman Catholic AnswerThe Sacraments of Initiation include Baptism, Confirmation, and the Most Holy Eucharist. In the Eastern Church they are all commonly given together to infants, and they are still given together to adults coming into the Church at the Easter Vigil.
There are only two sacraments of service in the Catholic Church. Modern catechists commonly refer to Holy Orders and Matrimony as sacraments of service, although please note that this term is not used in the Catechism, instead the Catechism refers to these as sacraments directed toward the salvation of others.
Catholic & Orthodox follow the 7 Sacraments (though in Catholicism a person may only take at the most, 6 Sacraments). Protestants do not have all 7 Sacraments.
http://www.gotquestions.org/seven-Catholic-sacraments.html