SALT LAKE CITY (AP) — The president of the Mormon church reiterated Sunday that he wants members, the media and others to use the faith’s full name, saying nicknames are “a major victory for Satan.”

Addressing The Church of Jesus Christ of Latter-day Saints’ twice-yearly conference in Salt Lake City, Russell M. Nelson said the church’s name “is not negotiable.”

“When the Savior clearly states what the name of his church should be, and even precedes his declaration with, ‘Thus shall my church be called,’ he is serious,” Nelson said. “And if we allow nicknames to be used and adopt or even sponsor those nicknames ourselves, he is offended.”