I think he meant today. Aren't like >90% of scientists in the hard sciences atheists or at least non-religious? Of course there are thousands of counterexamples, but by "hard to find" I think he meant if you went down to the local uni you might not find anyone at all.

Most scientists in the U.S. are nonreligious, or less religious than the general population around them, but the original commenter said you would be "very hard pressed" to find a counterexample who's a reputable scientist. Surely "very hard pressed" should mean it's actually difficult to do so.