>When I see a code of ethics bound to faith, I have to wonder what happens if the faith disappears.
Let's do the math:
Christianity has been around for around two orders of magnitude longer than any of the compilers or dev tools you're using on your project.
There are probably three orders of magnitude more people who use Christianity than are using any of the languages used in your project.
There are probably six orders of magnitude more priests and churches than there are maintainers on all but the top 1% of libraries (open source or closed source) you're using on your project.
I'm pretty sure the complete disappearance of Christianity from the face of the earth is not the highest probability risk to worry about for your project, and if it were to completely disappear there would probably be enough other stuff going along with that disappearance that we probably all have bigger things on our mind than the code of ethics published by a software team.
If the concern is just "what if the maintainers give up on Christianity," they're probably far more likely to get tired of programming (that happens far more often), but we can observe that their need to make a PR to edit their own code of conduct is not really going to be a particularly hard thing for them to pull off.