Interesting, but not authoritative.
But the view consistently offered by those with higher IQs than mine is that as you become better educated the more likely you are to be an atheist. I'm sure this hypothesis (or as I lovingly call them "blind guesses") is presented in printed publications written by scientists as hard fact.
Whether or not a scientist has any qualifications to comment on the existence of God throws open a whole new realm of discussion and debate. One prominent scientist in the UK has vehemently stated that God is a delusion and that children shouldn't be taught about God. He has also stated that scientists are mostly atheists and that those who say they aren't are likely to be lying.
So, by this standard - namely scientists aren't qualified to comment on God's existence - his words should carry neither weight nor validity.
Also, the fact that this survey was carried out in the early 1900s and then repeated in the 1990s shows that at least someone considered the premise to be worth looking into. Maybe the nature of the survey was flawed, maybe not, but that doesn't invalidate the survey having taken place, nor does it invalidate the results of the survey.
You see, if science has in fact proven beyond a doubt that there is no God, yet 40% of the men and women in the white lab coats who were polled for this survey are willing to state that they believe in God (remember, not a god, but God who answers prayers), then it would appear we're dealing with some sort of dichotomy among the Bunsen burners.
Also, claiming (as someone did earlier in the thread) that any scientist who believes the earth is 6000 years old isn't worth his/her salt as a scientist is a straw man argument.
