I was a Melaleuca rep for awhile. I wouldn’t worry about the fact that they are owned by Mormons. Though I don’t agree with Mormon theology, that won’t prevent one from being my friend or business partner.
However - I would be concerned with supplying funds to a company that perpetuates a drastically flawed business plan. This is a network marketing company, and, as such is essentially a pyramid scheme (though not legally such, and they can’t be prosecuted, it essentially is by its nature).
Melaleuca is no different from Amway(which is trying to make a comeback, warn your children - I recently saved my brother!) also known as Quixtar. Market America also falls in this territory.
The MO is usually to get people excited about “building a business” when all they’re going to be doing is recruiting distributors.
So to recap - the religion of the company here is not the problem - its the exploitative business model (though I am glad you’re not a member and your friend actually retails rather than trying to sign people up! That is the only ethical way to do business in this model, and its probably not very profitable!)