Yeah, immediately after I had wrote that I realized that I was confusing Newton with Galileo.
Galileo was a devout Catholic. One or more of his daughters became a nun. He even wrote a treatise where he referred to theology as the "queen of the sciences". He was also on very good terms with the Pope, who actually supported his scientific research.
Newton was a very unconventional "Christian", but perhaps it should be mentioned that many of his closest scientific associates whom he communicated often with were Jesuits.
there is probably a positive correlation between Agnosticism and intelligence.
No there isn't. And there are several problems with even trying to prove such an assertion. Namely the complex nature of belief systems, and the fact religious belief comes in endless forms. At best you can prove that certain forms of religiousity correlate with low intelligence, and others with higher intelligence.
And if there was an actual correlation: it still would not prove that religion is actually wrong.
Not only that, but allow me to add another twist to the equation. Let's say that there is such a correlation. Ok, but what are the exact attitudes of such people towards religion? Disbelief in religion doesn't necessarily equate to disrespect towards it. In fact it's quite common for atheists/agnostics to hold many aspects of religion in high regards, despite personal disbelief. Voltaire was no friend of religion, yet praised how the Catholic faith inspired people to do great deeds for the sake of others. I myself used to be such an atheist.
Which leads me to my main point, the issue is far too complex to make such blanketed statements.
Edit: Also, you hear these stories of people who are taught to be religious at a young age and over time discover that it is bullcrap (George carlin is a great example), this leads me more to the Nature side i guess..
You also hear stories of people who were never taugh much religion in their childhood and yet later on became religious. You also hear stories of people raised in religious enviroments, then rejected those teachings, only to later revert back to those teachings.
There's literally an endless variety of stories concerning peoples' religious experiences. So trying to reduce it to "nature or nuture" is bullshit.
Seriously, you people are presenting the weakest possible arguments in favor of atheism.