What you have said IS FALSE. It is IMPOSSIBLE to erase ALL evidence about something, especially such a big one. You can erase a lot of it, but SOME WILL ALWAYS REMAIN. If the enemy could erase all evidence of what happened in WWII, wouldn't they have done the same with Antiquity? If it were possible to do so, neither YOU, nor ME, nor ANYONE here would have ever known the truth and we would be with the enemy, but IT IS NOT SO. Go read ALL THE JOS WEBSITES and look at the REALITY, and see for yourself this fact. Just as there is spiritual evidence, there is also physical evidence.
(Don't take this as a personal attack, because it is not, but a correction to your answer; by the way, I used some capitalized words to highlight certain points).