So, which Jewish or Christian figure was responsible for convincing Marcus Aurelius (who I dare say was one of the wisest men to have ever lived, certainly one of the wisest to rule Rome) to insist on his son Commodus succeeding him? Do you think Jews or early Christians bioengineered measles/smallpox in Seleucia, a Parthian city, just so the Roman legions attacking said city could pick it up & spread it back home as the Antonine Plague? Can you name any Jew or Christian who advised the Severans in their twilight years, immediately preceding the Crisis of the 3rd Century (which is when the barbs took advantage of Rome's civil war near-death spiral to invade in force)?
We know the names of people like Theodor Herzl, Leon Trotsky (Bronstein), Bernardine Dohrn, Noel Ignatiev, George Soros and Benjamin Netanyahu today, as we know the names of disreputable courtiers & puppet-master sorts like Sporus, Hierocles and Eutropius from back then; there's no excuse for any secret engineer of the Roman Empire's downfall to have stayed hidden after all this time. You'll understand if I can't exactly accept a vague 'the Joos did it but I can't tell you who, when, why or what exactly they did' as an answer to the 'who caused Rome to fall' question.