“If there is no evolution, then why do we share the DNA of all the living creatures on the earth?”
Elements have certain properties that make them amenable for various uses.
I can imagine comparing evolutionary comparisons among PC’s, iPads, Game Boys etc...
If there is life on other planets it will be DNA/RNA centered, like here, because these molecules have physical properties that allow the functions of life to occur.
If there is life on other planets
this is probably something we will never know; what we do know is that the planets in our own system are completely lifeless, even incapable of supporting life as we know it...this is an argument I hear in contradiction to an intelligent designer, and it is a compelling one...
then again, since nobody can pinpoint the origin of life, I retain an open mind...