Do, please, avoid basing any argument on the work of that idiot, the Wizard of Sussex, Charles Dawson. Almost everything he "found" is questionable, so if you want to doubt things because of his tinkering, you'll have to rule out Roman figurines, Stone Age knapped flints, Roman tiles, Roman hipposandals... oh yes, and toads found in hollows inside flints, as well as human antecedents. Now the toads are probably well worth the doubt, but the others have plenty of confirmed evidence for their existence away from Sussex. And, a good thing arising from a bad, people will have been very, very careful in making sure that they haven't been taken in again with any of the individual skeleton material found since.

Saying that Piltdown Man undermines the whole of paleo-archeology or whatever the relevant science is called, is not sensible, and makes those who know better unlikely to treat any other argument you raise with respect.

Penny