Perhaps but when your being told convert or die I highly doubt that idea crossed thier mind at the time. Why would the Christians say any comparision to the Pagan gods? That would be like shooting yourself in the foot. The fact that the church used the pentgram was used to repersent the first five books of the bible was even more proof.
One of the earllist creation myth that of the Sumerians of Mesopotamia in which nammu, the primeval sea gave birth to the sky God An & the earth God KI. He begat Nanna, the moon who in turned fatherd Uta, the sun. Enil who imprereganted Ki, gave birth to Enki, God of water & of wisdom.Enki created the universe. His sister Nintu then created man by molding them out of clay. Sound familar?
Take the story of Satan for example He was punished for telling Adam & Eve to eat of the tree of knowledge. Anyone remember the story of promethius? He too was punished for bring fire to mankind the only difference was that Zeus only punished him & no one else.
First of all, "convert or die" wasn't an option for several centuries, at least not for the pagans. For the pagans had all the power until roughly the time of Constantine. And even then, it wasn't as though Christian troubles were over. Certainly during the time of the development of the catholic tradition (say, pre 600), Christians were not threatening pagans with death if they failed to convert.
Second, use of the pentagram to represent the five books of Moses doesn't prove that there was some sort of pagan origin to Christianity. It may mean that the church was doing what it always did -- subverting pagan symbols. By associating the pentagram with their own heritage, the church would have been changing the very meaning of the symbol. Take the cross, for example. It was the symbol of the ultimate in pagan authority and terror. But Christians turned that symbol of death into a symbol of life-giving love. The Church did the same with pagan festivals by providing alternative celebrations with Christian themes to replace the pagan ones. Thus the Church saw itself as redeeming what was pagan rather than simply destroying it outright. So, IF the church used the pentagram, and IF the pentagram was originally a pagan symbol, we can't assume that the church was adopting paganism. It could well have been subverting it. You'd need much more argument than the mere presence of the pentagram to demonstrate borrowing, much less pagan roots to Christianity.
Yes, the Sumerian myth is similar to what we find in Genesis. Note that that's in the Old Testament and constitutes part of the church's Jewish heritage. How do we account for the similarity? Did the Jews merely borrow from Sumer? Or did the Sumerians borrow from ancient Hebrews? Or did both groups share a common Semitic culture that made use of similar symbols and archetypes but invest them with different meaning? Or was the Genesis story intended as a reaction against Sumerian paganism, perhaps borrowing language and imagery, but investing them with different theological content so as to subvert the Sumerian story?
Obviously, I think it's the last possibility that's true, but whether I'm right about that is neither here nor there. My real point is that showing a surface-level similarity is not the same as showing borrowing, much less a continuity of theological perspective.