Here is an interesting theory of my own Min regarding where Mark may have got his ideas from. In the book of Isaiah chapter 53 we are introduced to a suffering messiah which Christians take to be a prophecy regarding Christ and his crucifixion. It is my belief that the whole Christ story itself is plagiarized and culled mainly from the O.T. When I was a Christian I could not see this I basically told people that the O.T. was the prophecies of things to come and the N.T. the fulfillment of those things in the ministry and person of Jesus Christ. Note that the entire chapter regarding this suffering messiah is written in past tense which I find very interesting indeed.
There is nothing people will not maintain when they are slaves to superstition
http://chatpilot-godisamyth.blogspot.com/
http://chatpilot-godisamyth.blogspot.com/