Look, I am not saying Christianity is a literal carbon copy of some single religion. Christianity takes practically its every concept, belief, story from someone else, often a number of faiths, and puts it in some place within its structure. You cannot expect one religion to be identical to the other - a bit of cosmetic change is needed to get people upgrade from Judaism 1.0 to Christianity 2.0.
People will not buy Windows 7 if it has absolutely zero new features and does not look different. But if it is more streamlined, merely looks different, and is given out at a lower price (Christianity was available and advertised to everyone, unlike some other religions), then people will swallow it, despite the fact it actually has less features than Vista, and still consumes vastly more resources than XP.
Grace is little different from the main tenets of Mithraism or Bhakti marga, which is where Mithraism got its idea, which was in turn 'borrowed' by Christianity. The concept is the same, save for a few aesthetic details.
BTW, good job on overlooking that the Old Testament bears little real relation to the New one though... That was quite a steal from the Jews... Not many religions can take something and adopt it practically without changing it and then call it their own... Forget the fact that the Old Testament champions entirely different laws, regulations, paths to salvation, morals, themes, etc... :S
EDIT:
Well yeah, I mean, I am not calling Christians idiots or anything. Someone gets a same base and everyone goes different ways from the same source. That is only natural. That is why I am not taking anything but the Bible and Early Christianity (which already had wildly differing views of course, but meh, at least they were in the beginning stages of the development).
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