In a few words ,because it is an obscure dialect, very poorly attested. People can be become obsessed these with 'the language of Jesus' . You can see that all over the web. There are articles,posts,videos all over the internet with pompous titles about 'the language of Jesus Christ' ,the ' Lord's Prayer in Galilean Aramaic '- the dialect Jesus spoke-,'Jesus Christ's Aramaic lives on' and many other titles of the like. But such claims are an overstatement out of place and out of time. I will try to explain some facts about the Aramaic language and Jesus's native Galilean Aramaic dialect. Aramaic -not one but hundreds of dialects. First off Aramaic in not one monolithic language unchanged through time. Every language undergoes many changes from the moment it appears. In time it changes in vocabulary,grammar, pronunciation ,it breaks up into dialects some of which evolve into new languages and so forth. The same goes for Aramaic. It has chan...