If there is life on Mars, it came from Earth anyway.
violent eruptions at the beginning of the Genesis judgment sent jets of water into orbit, creating the comets, and there is no reason not to believe that some of that water would have hit other planets, or moons.
What if it turns out to be different from the life on Earth? What if it uses completely different base pairs for its DNA? What if it uses something other than DNA? These are all questions which will need to be answered.
Are you saying that jets of water from earth created the comets in the solar system? Perhaps you're referring to your personal religious belief, and not scientific fact. Is that it?