But perhaps the strongest evidence we have so far that would suggest there is intelligent life out there would be the fact that they have not contacted us.
They probably took one look at our religious and political systems here on Earth, and decided that they would rather gouge their large black eyes out with a fork-like eating utensil than contact us. Or so I've heard.

We would just try to kill them or worship them as saviors of humanity anyway. The human need to worship, revere, and then destroy things is probably a little, um, creepy to outside observers.