Gambling
The Roman Catholic Church
The Catholic church teaches that gambling is not intrinsically wrong. But it becomes morally unacceptable when a person’s gambling becomes obsessive or leads to the gambler or their family suffering through loss of money. Archbishop Peter Smith
Games of chance (card games, etc.) or wagers are not in themselves contrary to justice. They become morally unacceptable when they deprive someone of what is necessary to provide for his needs and those of others. The passion for gambling risks becoming an enslavement. Unfair wagers and cheating at games constitute grave matter, unless the damage inflicted is so slight that the one who suffers it cannot reasonably consider it significant. Catechism 2413
The Church of England
The prime ethical objection to investing in [gambling] is the social damage caused by gambling abuse and misuse, which has tragic consequences for many families. Church investment and gambling
Methodist Church
The United Methodist Church opposes gambling in any form:
"[Gambling is a] menace to society, deadly to the best interests of moral, social, economic, and spiritual life, and destructive of good government." Book of Discipline