The rocks we have recovered show the isotopic "signature" of Mars origin. Every planet has isotopes in different proportions that indicate the origin of such rocks when they fall on Earth. We determined the Mars signature from the Viking probe and other subsequent missions. The rocks were blasted off Mars by massive impacts by asteroids and comets. Calculations of the speed of ejecta from the impacts show that the rocks could attain escape velocity from Mars and go into orbit around the Sun. The Allen Hills meteorites are almost certainly from Mars. In the center of the one meteorites the NASA team found fossils of nanobacteria. Since Mars was warm and had oceans while the Earth was still above the boiling point of water, the theory is that Mars could easily have had life before Earth. When the Earth cooled down, Martian rocks could have seeded the early Earth with bacteria spores. Sorry about the impact on theology. We just want the truth regardless of whether it offends anyone. When we find life on Mars (and I am willing to bet money on this) the bacteria DNA will tell us whether it has a common ancestor with us. Humans share DNA with more primitive lifeforms including bacteria. Flame away.
You're using the assumption that there were Martian microbes to begin with.
We have no evidence that life (of any kind) has ever occured on Mars.
(The "Martian Meteor" found in Antartica notwithstanding, because there is still debate on whether what was found in the rock was actually fossilized bacteria or the result of a simple chemical reaction).
Why would the assumption that life existed on other planets mean that there is no God?
And they giggle at us that believe in a Creator as an act of faith,and supernatural mumbo jumbo.