JOEL - There is no one in the LDS Church that is "non Christian". But anyone living on this planet, no matter what their current religion or lack of religion, can learn about and join the Church of Jesus Christ of Latter-day Saints, which would, of course, require them to change from their non Christian belief. Their first and foremost step in becoming a member is to realize the divine mission of Jesus Christ and to learn of His life and what He did for all of us. They would need to read the scriptures that testify of Him and develop a faith that He is the God of this earth and that it is through Him that we can be saved from our sins and have the opportunity to return to Him in heaven through obedience to His gospel. This can all be done with the help of missionaries from the LDS Church who can help them make the change and learn what they need to know.