Yes, but we're talking about how reasonable it is to believe something. If you can show me a way outside of logic that can help us determine how likely it is for a particular explanation to be true, please do so.
It is perfectly reasonable to think that aliens could exist because we have already observed life existing on a planet. Attempting to define or describe any potential aliens, however, is pretty silly because, yes, we haven't observed any.
Of course it explains something; it answers the question, "How did life arise on Earth?" It doesn't answer the question, "How did life arise?" But that's okay. Scientists don't generally attempt to answer all the questions at once. They focus on what they can given the evidence at hand.
Also, the word "God" does not explain how life came about. Yes, you can have a mythological story about the origin of life based on God, but that's not an explanation.
It's not a theory. It can't be proven. It's just accepting that you do not understand how life arose, because you're relying on something that cannot be proven in order to explain it.
Now, accepting that you don't understand how life came about is perfectly fine, because we don't really know yet. But I'm okay with not knowing. I don't need to jump to "God did it!" just because I don't know right now.
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