I happen to think it's likely that many thousands, perhaps 5,000 to 15,000 stars in our own Galaxy have planets with life. But without some science & technology we don't yet have, we can't know. Unlike the question of God, it may be question we can answer some day.
I've avoided saying what I think about the existence or not of God, because I think my own belief or lack of belief and the whole issue of God is irrelevant to science.
I hope someday we discover that something like a Jump Drive, Stargate and/or an 'Ansible' is possible and we can examine more closely the question of life elsewhere. To me, looking at characteristics of Stars, "Goldilocks zones", evolution and more orthodox and logically framed Theologies it seems likely that life must also be elsewhere if Evolution is purely blind chance, or there is a Cosmic Watchmaker or a Personal God. It would seem extraordinary anthropocentrically egotistical (or whatever the word is) for the Atheist or Believer to insist Earth has the only life in our Galaxy, or the Universe, or even to insist we are the only sentient life.
If you are an Atheist you have to believe that life here is mere chance (claiming it blew in from space via a comet or aliens doesn't solve it ultimately being chance for an Atheist). If you have faith in a Creator God, then even if every aspect of the theories of evolution are true, you can't believe it's chance. Life elsewhere only reinforces BOTH viewpoints, because of course a Creator God can create life anywhere and the size of space could be a quarantine to stop mutual interference. The Atheist will say, "well of course evolution produces life wherever the conditions are right."
Science and Observation can't aid the Atheist or Believer. Many Believers believe in fact God deliberately ensures existence can't be proven or disproven scientifically. Serious Philosophers that are Atheists would agree that God can't be scientifically proven to be imaginary or real. In the purest sense. Yes you can pick out various beliefs and theologies of actual religions and ridicule them as illogical nonsense. But that doesn't dispose of God. Sometimes too the 'logic' might not be scientific either but assuming that something is impossible because you can't understand it or repeat an experiment.
P.S. I don't think this section is suitable to discuss actual Beliefs (or not) in God. Perhaps Private messages or email. People can get irrational about Religion, Faith, God, Theology, Rationalism and Atheism on a forum thread!