The program stated that the books Moses wrote were the ones the Samarians had first. So my opinion to this fact, Moses had God leading Him in the way from Sinai to Egypt, not in the Samarian text, lots of miracles and signs of Divine power shown the pharoah and the country, not in the Samarian texts, and how about a slave nation being released from bondage by way of a separating of a very large body of water just in time for the Isrealites to escape, and closing just in time for an army of pursuers to be wiped out, also not in the other texts.
I would like to state that IMHO that Moses was too close to God to take either a colorful artistic slant to what he was to write down, or that he would copy another's book instead of writing as God instructed him to. You could ask the same questions for the Koran just being a copy of the Old and New Testaments, but some might think that heresy and fight you for even suggesting that.
God, Jesus and the Holy Spirit speak to and through Mary and myself. Some (most) would say we are just making this stuff up, or that we are just copying what has already been written, and only Mary, myself, God, Jesus and the Holy Spirit know the truth. Hard for us to convince others, yet those whom we are told to speak to hear the message.
As for the Adam and two wives saga, big deal, as God created male and female, and in the next, He formed Adam from clay by His hand and made Eve from Adam's rib, you could state the four of them (Adam, Eve, male, female) were separate from each other. How did Cain find a wife anyway, if there were no others around on the planet. When God did create male and female, the garden was not mentioned. God can do whatever He wants, whenever He wants, for whatever reason or wild hair He wants. He does not answer to me, and I will never understand him even in the small things as long as I wear this human baggage. Remember Enoch walked (had conversations with) God for three hundred years. I doubt Enoch got bored.
God through several folks spoke, and some took Him serious. Those wrote it down. The Samarians were close to Abram before he left Ur and went to Horan with his father. Ur was also the first seat of myth, around that same time. Maybe God was trying to tell them He was and still is in charge, through someone that would listen. I'm guessing most didn't. This fact hasn't changed through history. Is anyone out there listening now? Or are we just watching T.V. and waiting for others to tell us something amazing?