I am unable to believe God created life only here.
1 trillionth of 1 trillionth of the Universe.
If that.
...
I can believe it.
Regardless of what we believe, it is what it is.
Even is there is life elsewhere, there’s still a lot of real estate with no life. Probably at least a ratio of a trillion times a trillion.
The vast universe, empty of all life and desolate, declares how exceedingly amazing and totally special life is. It is a huge statement by Almighty God! It is a statement that is so true and amazing that the human mind cannot completely rap itself around it. The more one learns about the complexity and fathomless miracle of life any intellectually honest person has to know that only an absolutely astounding, perfect and all knowing God could have created it.
Earth is alone concerning life, but not alone concerning God.
And consider this, if Adam and Eve were superior to current mankind in both intellect and physical form, obeying their own rationality and relying on their own abilities would be far more tempting that it seems to be in hindsight.
People who argue that the Universe is too large for there to be only mankind have a very, very, limited view of both what God originally intended for His creation and of the Creator, too, if they believe in God at all.
JMHo