I think it would be interesting to have a thread on religion.
This graph by OurWorldInData shows that the percentage of the world's population identifying as religious fell by less than 1% between 2010 and 2020 (the latest available year for comparable global data).
https://ourworldindata.org/grapher/reli ... ator=share
If that continued in a linear trend, it would take until the mid-29th century to reach zero percent.
However, the decline is much faster in Western societies: