They're allowed a choice of answers, of course, so saying "all scientists should be militant atheists" is painting with a brush too broad.
They should also (generally speaking) welcome people from a diversity of cultures and ways of thinking, as these people can provide different perspectives on the questions in their field.
+ good book, btw: http://www.amazon.com/Religion-Human-Evolution-Paleolithic-A...
for further reading, consider: http://www.amazon.com/Religion-Human-Evolution-Paleolithic-A...