I found the following quote from the former Vice President of Mensa International and president of the American Humanist Association and author of like a bazillion brilliant books very thought-provoking:
I prefer rationalism to atheism. The question of God and other objects-of-faith are outside reason and play no part in rationalism, thus you don’t have to waste your time in either attacking or defending.
Asimov was an avowed atheist in the context of his personal feelings, but the point he makes here does illustrate the flaw in rationalists even bothering with atheism, because it has no place in Empirical thought. While continual rejection of theist attempts to impose their irrationality on society remains imperative, taking a position of promoting atheism is equally irrational. The theism/atheism debate has no place in rationality whatsoever.
In other words, a Scientist who has the time to be an atheist isn’t doing enough science.