Well, it is a fact that men are much more likely to sexually abuse children.
Not sure if a woman being present would make me feel better about it, since there's quite a few women who, while not predators themselves, make excuses for such men.
I suppose it is safe enough if there's like five adults present and everyone can see what is going on.
However, in a more traditionally built nursery, where toilets and changing room are not in a glass box, and where staff members are alone with the children, I might well feel different.
And obviously, what sort of person the female staff are would also make a difference.
Rural, remote places where the women are rape apologists and patriarchy handmaidens usually don't have any male nursery staff, but if, say, laws were changed so nurseries have to hire men, then those rural places would have a very high risk of hiring pedophiles (as the average man in such areas doesn't want to do the job) and they might only have two people working there at the same time anyway, et cetera.
It depends on many factors.
Question: Did parents ask that male members of staff not provide intimate care for their children before they put the children in your nursery, or after?
If parents asked for things to be changed after the child was already there for a while, I'd wonder why they didn't trust male staff anymore and if there might be a reason for this.
If before, they might have made the same calculations I did, or perhaps they just are sceptical about it as they aren't used to men changing babies' diapers - as you mention other cultures/religions.