score:3
The in my opinion most appropriate definition of what constitutes a follower of Jesus Christ is simply this:
5 He that receiveth my law and doeth it, the same is my disciple; and he that saith he receiveth it and doeth it not, the same is not my disciple
see also Disciple
Regarding other churches, this quote by Gordon B. Hinckley sums it up well:
βLet me say that we appreciate the truth in all churches and the good which they do. We say to the people, in effect, you bring with you all the good that you have, and then let us see if we can add to it. That is the spirit of this work. That is the essence of our missionary serviceβ