CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2137–2141

2137 "Men of the present day want to profess their religion freely in private and in public" (DH 15).
2138 Superstition is a departure from the worship that we give to the true God. It is manifested in idolatry, as well as in various forms of divination and magic.
2139 Tempting God in words or deeds, sacrilege, and simony are sins of irreligion forbidden by the first commandment.
2140 Since it rejects or denies the existence of God, atheism is a sin against the first commandment.
2141 The veneration of sacred images is based on the mystery of the Incarnation of the Word of God. It is not contrary to the first commandment.