1. Would evidence that life used to exist on Mars threaten Christian beliefs?
I fail to see how it would, or even that it should. Taking for granted the Christian belief that God created life on Earth, that does not preclude his creating life elsewhere in the universe. The question of whether he did or not may be interesting but it's one that the Bible doesn't address.
2. God is said to be the creator of all things. If life did arise on Mars and then go extinct, what's the message? Was it a failed attempt by God to get life going?
Let's assume for the sake of argument that we find evidence of life existing on Mars for billions of years but eventually going extinct. If that be the case, then it would not be a failed attempt by God to get life going. It arose and endured for billions of years. Mission accomplished, so to speak.
Did something go askew with that life and God destroyed it? I have no idea. No one does—including you, I should expect. Maybe it just petered out, as you said.
Assuming that such evidence is found, are Christians committed to insisting that it's phony, that scientists don't know what they're doing? No. There are, of course, some Christians who would believe and say such things—they're the ones who say similar things about climate change—but nothing in the Christian world-view would commit them to such a response, so far as I'm aware (but I'm open to being shown otherwise).
3. What do you see as the Christian response to evidence of ancient life on Mars?
Interest and curiosity, plus in-depth theological reflection on hard questions about our long-standing human conceit.
4. The window closes February 18, 2021.
More or less. It has to land, deploy, collect its samples, perform its analyses, send back the data—you get the picture.
At any rate, I'm super excited about the results, especially if we find evidence of life possessing a genome vastly different from terrestrial life. That would fuel decades of evolutionary thinking and abiogenesis research. (In other words, it would be disappointing if it shared a similar genome, because then it more likely was terrestrial.) Although the universe is probably teeming with life, I expect it to be quite limited because I also subscribe to the Rare Earth hypothesis. Eukaryotic and multicellular life might exist—something akin to algae or plants—but I'd be astonished if we found anything as compex as arthropods or chordates, especially if we found advanced intelligent life.
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otseng wrote: ↑Thu Nov 12, 2020 9:54 am
If there are intelligent aliens on another planet, would they sin also?
Speaking for myself as a Christian, I am not aware of any reason to think they would sin or need salvation. That situation exists for humans (but no other creature on Earth) because of the covenant relationship that exists between us and God. Without that covenant relationship, there is no such thing as sin. So intelligent life on other planets would be no more guilty of sin than non-human intelligent life right here on Earth.
otseng wrote: ↑Thu Nov 12, 2020 8:55 pm
For myself, if any life was found on another planet that did not arise from Earth, I would then say Christianity would be based purely on blind faith.
I'm curious: How does this follow?