Finding microbial life on Mars would force the conlcusion that life on Earth was seeded by life on Mars because even Dawkins admits that the odds of abiogenesis are fantastically remote. He ducks around the issue by saying basically that, well, there are lots of worlds, and lots of time, and it only has to happen once, you know (paraphrase from the Blind Watchmaker).
"because even Dawkins admits that the odds of abiogenesis are fantastically remote. "
Yes, but they have already worked around that. Leonard Susskind, the inventor of String Theory, says:
"With an infinite number of universes, says Susskind, there is bound to be one with a cosmological constant like ours."
Okay, right. Nothing like working backwards from the answer. Gee, I thought science didn't do that.