Would it be deceitful to create rocks that look just like dead animals, otherwise known as fossils?
First, this would require God to purposefully manipulate the ratios of isotopes within the rocks in such a way that when we use multiple and independent parent/daughter systems they all produce the same age. For example, God would have to carefully change the K/Ar, U/Pb, and Rb/Sr ratios in rocks within the same geologic strata so that when we use their observed decay rates those ratios all produce the same age. Does that make sense?
Second, after God manipulated the isotope ratios in those rocks he would have to create the fossils that are found underneath them. Obviously, when animals like a T. rex die they don't bury themselves hundreds of feet into the ground. Therefore, when we find something like a volcanic ash layer above a fossil we correctly conclude that the ash layer had to come about after the T. rex died. Those volcanic ash layers are the ones you are claiming were created by God as part of the creation event. This requires God to also create the T. rex fossils that lie under those volcanic ash layers.
Does this sound like something God would do?