If you look at it from a biblical / religious angle, God might be seen as falling in the category 'alien', and so would the angels...
But that would be it.
Currently there would be a dispute between God and the devil about who has the right to tell us what to do, in which Adam and Eve chose not to do it God's way.
If on another planets, other life forms had chosen the other way, the dispute would have been solved, but since there is still such chaos on earth, according to the Bible because Satan is the ruler of this world (behind the politicians backs). Once we have proven we cannot live peaceful lives without following Gods commands, he will fix the world by eliminating the people that chose against him in the Armageddon. After that, we have a Precedent to follow if the dispute arises again.
So if you believe this, you would also believe God has not yet created other sentient life in the galaxy, and God and the angels would be the only 'Aliens'...
One would still have to vote 'Yes' though.