Atheists and Agnostics risk infinite loss for no gain

[Mister Agenda]

But why would we not be getting radio waves?
Most civilizations would be emitting them for at least 100 years.

That would be because there are no civilizations emitting radio waves close enough to Earth for us to detect. The probability of a civilization and the probability of life are two very different things. You can't have a civilization before having life, but there could be plenty of life while civilizations might be one to a galaxy or less. For all we know, we're the elder race of the Milky Way, or even the universe.

That we've been emitting radio waves for around a century doesn't allow us to extrapolate to other civilizations. They could be in their Stone Age or Renaissance or advanced far beyond our primitive Earth radio eons ago.