There are just too many, in too many different places, for fossils to be a fraud. The "bones" and fossils are made out of rock. The rock molecules have replaced the bio-molecules, but keeping the same structural pattern.
Fossils are real evidence of pass existence. The question is when. Modern science doesn't doubt that their dating decay rates have been constant. This dating consistency has laid out a time-line for past events. This has become the norm for most. This gives us the age of the earth, for instance.
But, there are still problems. These decay rates are based measurement of course, but also depend on certain "daughter" chain products(nuclei). Google "daughter problems with Radiometric dating techniques".
There are still many mysteries about the decay constant. There might be a link between it and solar flares, believe it or not. Perhaps they have resolved that one, haven't checked.
In other words, if the dates are true..........then there are other things(matter/nuclei) out of place. Or out of time. And no clear understanding of the displacement. It's like all the other sciences, it doesn't fit quite as well as it should.