The problem is that chrstianity assumes the truth of the "old testament." It then claims to "fulfill" it. And chrstians "prove" it does by quoting their own claims.
Both "denial of the antecedent" and "affirmation of the consequent" are logical fallacies. Assuming the truth of the disputed point is "affirmation of the consequent." Denial of the common assumption understood by both is "denial of the antecedent."
Actually, if there were no written Bible Judaism would still be true because of the historical memory of the Revelation at Sinai. It would still be the only revelation of its kind in all human history.
I am convinced that Rabbi Saul of Tarsus knew a whole lot more about Judaism and the fulfillment in Jesus than you. But you keep raving for your own ego’s sake. God can work with the hot or cold, but he spits the luke warm out. You might take Abraham’s cue: ‘Abraham believed God and it was counted for him righteousness.’
Likewise...
Actually, if there were no New Testement, CHRISTIANITY would still be true because of the historical facts of the events in Jerusalem ~ 2000 years ago.
SOMEthing happened amoung the JEWS that has DRASTICALLY changed this world.