Catechism of the Catholic Church
160 To be human, "man's response to God by faith must be free, and... therefore nobody is to be forced to embrace the faith against his will. The act of faith is of its very nature a free act." 39 "God calls men to serve him in spirit and in truth. Consequently they are bound to him in conscience, but not coerced. . . This fact received its fullest manifestation in Christ Jesus." 40 Indeed, Christ invited people to faith and conversion, but never coerced them. "For he bore witness to the truth but refused to use force to impose it on those who spoke against it. His kingdom... grows by the love with which Christ, lifted up on the cross, draws men to himself." 41
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.