As I understand the Overton window it refers to mainstream opinions. Using Treviños degrees of acceptance they can be either Policy, Popular or Sensible. Outside the Overton window you have Acceptable, Radical and Unthinkable. In the general population a politician from a major party who wants to stay in office will only move within the Overton window. But not everyone is forced to stay within it, there may be quite large groups within the population that accept more controversial (e.g. “Radical”) statements, but for the time being you will be denied mainstream appeal if you voice such opinions.
One such “Acceptable/Radical” example within the Rationality community could be “AI safety is overrated”. The “Christian god” example would probably fall under “Unthinkable”.
I agree that taking action to make it safe to share even very controversial opinions would be good. Do you have a suggestion?
tl;dr My understanding of the Overton window does not imply that every opinion outside it will make you lose significant status.
Read a summary of the event https://www.rationality-freiburg.de/posts/summary-meetup-2022-05-13/