It also strikes me as an incredible leap to suggest that just because our current understanding of the decay of collagens in a fossilization environment can’t explain the presence of those collagens, therefore the whole thing is wrong and the dinosaurs lived only thousands of years ago (and somehow almost all of their bodies mineralized so quickly except this one tissue; and yes we have found fossilized skin). Occam’s razor would suggest that we probably just don’t know enough about collagen preservation yet.
Maybe. But there’s also the possibility that the fossilization happens quicker than is normally thought (you mentioned fossilized skins); if that is the case then the underlying [soft]tissues may also be effectively sealed and thusly more preserved than thought. (Like, if you will, forming a can around the food.)
Occam's razor states that the explanation of any phenomenon should make as few assumptions as possible, eliminating those that make no difference in the observable predictions of the explanatory hypothesis or theory.
To quote Isaac Newton, "we are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances. Therefore, to the same natural effects we must, so far as possible, assign the same causes.
By the way, Occam and Newton were both devout Christians.