How would the world react if (when?) we discover incontrovertible evidence of intelligent life on other planets?

For this hypothetical, let’s say it’s not aliens actually visiting earth. But let’s say JWST finds a planet maybe a few hundred light years away, and we can see lights and cities and maybe spaceships or stuff like that around it. So no contact, but 100% proof there’s intelligent life out there. How would humans (and different groups of humans, like conservative Christians) react to this?