With all due respect, the Old Testament is the Old Testament. No human made it obsolete, God made it fulfilled in the New Covenant in Jesus Christ. The Torah is a gift from God but Jesus is God. I respect that you do not believe this but you must respect that I and over a billion Christians do.
Do Christians believe that G-D specifically instructed you to change its name? If He did, then why? If He did not, then why do you?