Wall posts are fun, but I do have a Bible. If you want to make an argument, it helps to see your work. You have made no argument whatsoever for Gentiles (such as I) being obligated to the full weight of Moses. If in fact you do allow that exemption, then presenting the passage in Matthew 5 as if it were universal in scope is misleading. If it is NOT obligatory on Gentiles, as you seem to admit, then you also admit that, at least for some individuals, what Jesus taught in Matthew 5 is “no longer extant,” and so qualify for your own disapproval as one who has disavowed Messiah.
On the other hand, if you will stand by your limitation of scope to Gentiles, you also concede that Matthew 5 does have limits, and therefore believing Christ when He Himself identifies a limit in time, both in the prediction and the fulfilment, is NOT a disavowal of Messiah, but rather a more complete submission to His authority in recognizing the difference in terms between the Old Covenant and the New.
But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Yes, I allow the Gentiles are granted an Apostolic exemption, as it were, within limits. I believe and trust all the Jewish Apostles, save Judas who fell from grace as it were. The historic disunity and progressive splintering into myriads of discordant faith groups is much more dissonant and absurd than believing Matthew 5 still applies to our teaching.