One of these days, maybe the light in your head will go off and you will realize that the creationists are feeding you BS!
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There is a certain vagueness about some of the critical events. Dawson contacted Woodward about the first two skull fragments which were supposedly found by workman "some years prior". Exactly when is unknown. Similarly, the discovery of Piltdown II is shrouded in mystery. Supposedly Dawson and an anonymous friend make the discovery 1915; however the friend and the location of the find are unknown.
The reaction to the finds was mixed. On the whole the British paleontologists were enthusiastic; the French and American paleontologists tended to be skeptical, some objected quite vociferously. The objectors held that the jawbone and the skull were obviously from two different animals and that their discovery together was simply an accident of placement. In the period 1912-1917 there was a great deal of skepticism. The report in 1917 of the discovery of Piltdown II converted many of the skeptics; one accident of placement was plausible -- two were not.
It should be remembered that, at the time of Piltdown finds, there were very few early hominid fossils; Homo neanderthalensis and Homo sapiens were clearly fairly late. It was expected that there was a "missing link" between ape and man. It was an open question as to what that missing link would look like. Piltdown man had the expected mix of features, which lent it plausibility as a human precursor.
This plausibility did not hold up. During the next two decades there were a number of finds of ancient hominids and near hominids, e.g. Dart's discovery of Australopithecus, the Peking man discoveries, and other Homo erectus and australopithecine finds. Piltdown man did not fit in with the new discoveries.
In the period 1930-1950 Piltdown man was increasingly marginalized and by 1950 was, by and large, simply ignored. It was carried in the books as a fossil hominid. From time to time it was puzzled over and then dismissed again. The American Museum of Natural History quietly classified it as a mixture of ape and man fossils. Over the years it had become an anomaly; some prominent authors did not even bother to list it. In Bones of Contention Roger Lewin quotes Sherwood Washburn as saying
"I remember writing a paper on human evolution in 1944, and I simply left Piltdown out. You could make sense of human evolution if you didn't try to put Piltdown into it." Finally, in 1953, the roof fell in. Piltdown man was not an ancestor; it was not a case of erroneous interpretation; it was a case of outright deliberate fraud.
Teilhard de Chardin was in a position to know that Piltdown was a hoax, and he never mentioned Piltdown in his writing. That's pretty odd if he believed it was genuine.