you are missing the point somewhat, it is about attributing assumptions to make definitive statements as if they are fact without sufficent evidence to support that definite position. You can use the question 'does life exist elsewhere' if you wish, the criteria of having sufficent evidence to support the proposition still applies. The original question wasn't 'does life exist' anyway, it was 'does extraterrestrial life exist'.......to which the criteria regarding evidence remains the same from the perspective of those who dismiss one proposition for the lack thereof, yet accept the proposition for the other regardless of the lack thereof......
Whether one proposition is more likely than the other is immaterial, as the point was the acceptance of a definitive, therefore factual position for the positive with one, but the negative with the other using contradictory positions to assess the relative validity.
So it is not about whether ETs are more likely than God, but attributing a ' Yes Aliens definitely exist' based on limited evidence and assumption against attrubiting a 'No God definitely doesn't exist' based on the same......you can say 'The likelihood of God is somewhat less than the likelihood of Extraterrestrial life' and base than on the statistics, example of life on Earth etc...and assumptions made from that, but not that one definitely exists while the other does not......I hope that clarifies my opinion somewhat.
Also, with Life, we define it by our own experience of it, with God there is no such universal definition...if I define God as being the Universe in which we inhabit, can you say that there is no evidence for such......or simply that you don't accept the definition.