Once word gets out that aliens are real and have been living alongside us undetected for ages; "normies" will lose their shit.
Christ followers will be unable to reconcile this with their dogma and flip out.
Many of the Christian denominations refuse to believe in even the possibility of life anywhere except earth. Having proof would put a lot of them in severe mental stress. If they even get a whiff of it in the news they declare it the work of Satan and protest.