You have not provided any evidence for your claim that there is no connection between the "christian" saying and the prexisting jewish saying. The schoolars disagree with you that there exists only one single historical intepretation of the saying. You are just reading in what you personally want the text to read. Just like all fundamentalists.
You don't need to prove a negative. For any trillion combination of sayings which share 4 or more words in common no evidence exists for the connection of one to the other. The words are manifestly different save for using the same idiom about a camel through the eye of a needle.
They are again different in meaning with one being that attachment wealth is a barrier to being saved and the other being through god all things are possible. If you believe a plain interpretation of the text is in accurate the onus is on you to prove why and you haven't.