They are also advertising for an Administrator with the same Christian requirement
Again, if the admin job has a JD that includes religious guidance to the folks that come to the centre then again, it’s fine to discriminate against those candidates who don’t believe. If not, then that’s probably not legal.
do you think that is fine?
It’s the legislation set out in the equalities act, whether i think it’s fine is moot.
Why do you need to be a Christian to do administration well (or outdoor instruction)?
Because if they instructor/admin is expected to give religious guidance then it make sense to be able to discriminate towards folks who believe, or against those who do not. Why would you, if you don’t believe, want to go and work in an organisations that’s going to expect you to give (for instance) biblically/Christian appropriate answers to guest’s questions about life the universe and everything…
I get that it otherwise probably seems like a good opportunity to your friend, in a limited area of available work but it may not be a good a fit.