Religion will have absolutely no problem to adapt to new information and incorporate it as though it had always been there. This has happened time and again in the past to the point where the religions of old would have been in direct contradiction with even the most basic scientific knowledge if they didn't adapt. The funny thing is that the so-called holy books are full of stuff that no sane human would believe in. That doesn't stop a lot of people from doing just that when those books are creatively re-interpreted by intermediaries.

Religion will last for a very long time into the future, forget about major lasting change on that front other than some rearguard action to ensure survival.

Nah... religious people don't depend on reason, logic, evidence, etc. They can (and will) always absorb any new discovery and incorporate it into their belief systems in such a way that it doesn't invalidate anything they already believe.

Some people think Christians would have a hard time with extra-Terran life because the Bible doesn't mention any life other than the life here, and therefore any such life would arguably be free from the weight of Original Sin, yada yada yada. But I'm pretty sure if life on another planet was discovered (even intelligent life) they would just reinterpret the Biblical references that seem to refer to "Earth" as referring to "The Universe" and make "The Garden of Eden" a metaphor, and the flaming sword would become a supernova, blah, etc., yada, blah, blah, blah. At the end of the day, approximately 0.0% of Christians would say "Hmm... the Bible is obviously incomplete and or inaccurate, so maybe the whole thing is a load of bollocks" or whatever. And I expect it would be about the same for every other faith.

No, because the origin of life on Mars would probably be the same event as on Earth, with life having been transferred by impact ejecta. It would not allow us to conclude that origin of life was common.