My point is the reasons that life as we know it cannot practically exist on Mars today applies to the past as well.
Who are we to question how the creator works?
I know I'm not qualified. Does the creation of life in any way he sees fit (not that I'm saying this is how he did it) have any affect whatsoever on our own salvation?
I don't see it.
My point is the reasons that life as we know it cannot practically exist on Mars today applies to the past as well.
The evidence that there was once liquid water on Mars is pretty conclusive at this point. The Martian environment was very different a billion years ago than it was today. It was not nearly as cold as it is today, because there was much more of an atmosphere to trap in the heat (the "greenhouse effect").
So, unfortunately, your point doesn't really apply, because conditions on Mars today are nothing like they were a billion years ago, when it is thought life might have arisen on Mars.
And, let us not forget, this talk of Martian life is pure speculation at this point. Just because the conditions on ancient Mars could have led to life doesn't mean it did arise. That's one reason we need to step up exploration of Mars; to settle those questions.