I think it's highly unfair to call a non-believer in religion or god or anything supernatural, closed-minded. Religion or any belief in God to an extent is an exercise in closed-mindedness. The religious rejection of science is a good example of that. Believers in God "know" they're God exists, and is the reason behind everything. That is the ultimate closed minded belief as it doesn't allow for change nor discovery. Science, by it's very nature, is an emergent process, as the journey of discovering the natural world continues and continues. By that sense, no scientist can be called closed-minded.
The only non-closed minded believer in God would be someone who is open to the possibility that God may not exist.
I think it is unfair to call scientists who believe that God exist narrow minded as well. We have a lot of accusations from atheists and from people who behave in a certain manner