Jesus's first miracle was to create something with the appearance of age, wine.
If God decides to hang stars and galaxy's in the sky for lights and to tell the seasons by, why do you imply any other motive?
He wanted them, He made them. He gave us the timeline of creation. The fact that we don't understand how he did it or why he created them a certain way, and then we try to impose natural causes, and conclude that they must be old, is not His problem.
Respectfully, I for one do not find religion and science to be in conflict. It is the misguided proponents of either who are in conflict.