Are Polygamist Cults Members of The Church of Jesus Christ of Latter-day Saints?

Some people think of Polygamist groups as apostate members, because once members of The Church of Jesus Christ of Latter-day Saints were commanded by God to practice polygamy. By that reasoning these groups could also be called Jewish, because long ago God also commanded them to practice polygamy. Since Christians also believe in the Old Testament, then would Polygamists be considered Catholic or Protestant?

Yes, these Polygamist groups claim to be living the revelations that were given to the Prophet, Joseph Smith, but are they?  Take a closer look.  Basically, they seem to have only heard of some of the teachings of The Church of Jesus Christ of Latter-day Saints. They consider the Book of Mormon as just a good book, not scripture revealed by God as members of The Church do. They have a man they call a "Prophet", but he is not chosen by God and he does not receive revelation from God, so he is not what we would consider a Prophet.

 In my opinion, any one who latches onto an old revelation of God given for a specific time and tries to continue it when the Lord has revealed that it must cease, is not following the Lord. He certainly is not a member of The Church of Jesus Christ of Latter-day Saints.