My hypothesis

[Pat Mustard]

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Actually the gospels only count as two sources. Matthew and Luke are clear plagarisms of Mark. And all they do is document what people believed at certain periods in the late first century and second century CE, two to five generations after Yeshua's alleged death. And imperfectly at that, because we know the gospels have been subject to insetions and editorialising over the subsequent centuries which have massively changed their messages.