#8, at least with the search for extraterrestrial life, we have one point of proof: ourselves and our biosphere. We can not only take ourselves as the one point of data, but our development on Earth shows every indication of having happened naturally, hence it's only logical to suppose that such natural development would have happened on other worlds across the universe.
For divine issues, instead, there's no proof whatsoever, just a bunch of baseless and unbelievable claims, and centuries of bullshit stories. In addition, there's no "ecology of divinity" to study in order to perform extrapolations. There's just NOTHING.