Religion has zero to do with this. It is easy to believe both God and aliens are real, only one of them is real or that neither is real.
You make a good point about the possibility of other dimensions but that isn't what I mean when discussing aliens,. I mean aliens from our known universe.
It is far from self important to look at facts rather than hope or supposition. The fact is that we have been listening for signals for decades. We've detected information from billions of years ago, millions of years ago, thousands of years ago, hundreds of years ago and from present day. We've done so while looking in every direction. We have gathered an incredible amount of data and zero bytes of that data indicate anything alien in origin.
The point isn't that we can ever know that something doesn't exist. We can't. But if the universe was teeming with life we would know by now even using our relatively crude technology. We would have known within minutes of detecting our first signals from space. That is math, not self importance. The more we listen and the less we hear, the more likely it is that we're alone. Every minute that goes by without detecting anything proves over and over again the extreme rarity of intelligent life out there.
It is very clear that the existence of intelligent life in any given place is like hitting the lottery. And we hit it. This isn't like the Powerball though. Think of having to hit the right 100 numbers and the Powerball from a pool of a trillion numbers,. It appears to be something like that.
Sorry. I only saw about 5 episodes of the show and one had Drake's equation in it. None of them had his mother.