You seem to be sure that it actually is unique. Hindus, many atheists, etc. would argue that there are literally thousands of planets which can support life, similar to or better than the earth. The universe is pretty big. It contains trillions upon trillions of stars, and therefore trillions upon trillions of solar systems with many planets within each solar system. That adds up to many, many planets which could all have life on them.
To even be able to make a claim concerning this planets uniqueness you would have had to have checked the entire universe.
Of course it wouldn't. Some new ones would crop up, of course, but the old ones would push on as they always have. God created the Heavens and Earth. God, in the Abrahamic religions, is seen as a universal God, not simply a local one. If he created all, he created the aliens too. It wouldn't be the least bit difficult for the apologists to take this blow, and not even break stride. What I think would be interesting to see would be those committing destruction, death, slavery, theft and every other atrocity man has committed and justifying it with the "fact" that if they are not humans, they are animals.
It's unique as in ONE. It's one of 9 or 10 planets we know ANYTHING about. They can barely make out 200 other planets discovered so far, mostly gas giants. We have really no clue whatsoever how "unique" our planet is. We have only guesses, based on our experience with the KNOWN history of our solar system in our spiral arm of our galaxy.
