This is partly a sociological question, and therefore an empirical question, however, this sort of question is very much an open question in philosophy that explores the relationship between Religion and Science (SEP). From the article:
The relationship between religion and science is the subject of continued debate in philosophy and theology. To what extent are religion and science compatible? Are religious beliefs sometimes conducive to science, or do they inevitably pose obstacles to scientific inquiry? The interdisciplinary field of “science and religion”, also called “theology and science”, aims to answer these and other questions. It studies historical and contemporary interactions between these fields, and provides philosophical analyses of how they interrelate.
Going back to Asia Minor before Socrates, the division between the physiki and theologi became evident. Since then, methodological naturalism has grown to be a very popular tool of dealing with the world so much in fact, that it has impacted religion over the centuries. Consider the growth of natural theology and how the Catholic church today is highly supportive of science. (The Pope is a chemist by training, in fact!) Today, at least for contemporary Western philosophers who are heavily materialist in their view (for instance the entire logical positivist movement were practicing scientists), the terms 'God' and 'soul' have no material basis and therefore tend to be treated in such communities as a historical topic. Add to that the movement to separate church and state in Western Europe, and the ample opportunity for believers to find theological communities which support their faith, and it seems quite natural for a divergence to occur.
Today, philosophers of science have a very large body of work that simply doesn't require metaphysical naturalism, but seems to encourage its adoption, alongside methodological naturalism. Men like Popper, Hempel, Feyerabend, Kuhn, Gross, van Fraassen and others, while they may disagree radically in their approach (it's systematic, it's anarchic, it's sociological, it's confirmatory, it's about falsification, it's rhetorical, etc.) all rely heavily on methodological naturalism. Such an approach requires peer review, physical measurements, integration into major theories (such as gravitation, atomic theory, and evolution), and operationalism. Such a consistent worldview, whatever its metaphysical merits, produces real-world results that are hard to ignore: the fusion bomb, the self-landing rocket, vaccines, supercomputers, heart transplants, etc.
Why? Perhaps because methodological naturalism strongly encourages a way of thinking about the world that encourages challenges to authority, denial of that which cannot be directly observed or measured, independence from political and religious authority, a strong tie to logic and mathematics, etc. And unlike religion which generally carries the imperative to believe in the God as the religion promotes he/she/it/them, scientific communities make no demands on your emotional, faith-driven, and personal beliefs that don't bear on theory. If you want to study quantum physics and be a Hindu, as long as Hinduism doesn't try to dictate how to run experiments or what the standard particle model is, more power to you.
This scientific-mindset which is now heavily part of philosophical discourse since the emergence of science from the natural philosophy of the Renaissance (SEP) means that the most brilliant philosophers tend to be highly versed in the philosophy of mathematics, logic, and science. And this may have a lot to do with the emergence and structure of the European university system which is a central thesis in The Rise of Early Modern Science (GB) by Toby Huff.
The business of exporting materialism, naturalism, and liberalism is now a global industry with contemporary universities being heavily influenced by the works of many great philosophers: Marx, the positivists and logical positivists, the Skeptics, the Classical Empiricists and Rationalists, and 20th century thinkers like Quine, Husserl, Russell, Sartre, Camus, Wittgenstein, critical theorists, and others. Too many to list, in fact. The result of these social forces is that modern universities turn out philosophers and scientists who embrace this materialism, naturalism, and liberalism in their thinking.
Lastly, it is rather evident that religions and theologians, with some notable exceptions in the world, have also become less violent and authoritarian which is a traditional mechanism to enforce belief in God and religious doctrine. The Catholic church no longer goes on Crusades or conducts Inquisitions. In line with Gould's thinking, mainstream religions and the secular societies that rely on universities have entered into a truce, much in line with Gould's notion of non-overlapping magisteria. There are cults and religious extremists in the world who use violence, but the vast number of the billions of humans who believe in God tend to eschew violence as a solution to conflict. As universities and education spreads (it was once the provenance of a small minority in society), materialism, naturalism, and liberalism also spread resulting in an increasingly pluralistic and multicultural society whose Internet undermines traditional religious techniques for enforcing belief in religious doctrine. In the Western world, a person often chooses a god or denomination, instead of vice versa.
Even in the US, which is atypically religious for a developed nation, the number of non-religious people almost doubled in less than 20 years according to Pew. And where are philosophers drawn from? The general population, of course. So, professional philosophers are on the average very well read and educated, and intelligent (as a major, they score at the top of the LSAT roughly neck to neck with mathematicians), and go through the university system and a programme of materialism, naturalism, and liberalism. They generally show an interest in mathematics, logic, and science. And they are inevitably exposed to a strong tradition of freethinkers, agnosticism, and atheism in a formal curriculum. Should it be so surprising, that they manifest doubts and disbelief about the supernatural and faith-driven belief? To resurrect the Laplacian apocrypha, God is simply a hypothesis that many professional philosophers find increasingly unnecessary.