Your alternative proposition (hypothesis has a different meaning in philosophy than it does in the sciences) is rather confusing from a philosophical perspective. What is 'educated'? Education is a culturally relative idea that is very hard to closely define. Thus, for a religious person being 'educated' may mean something very different from a gypsy who grows up on the streets of Paris who is very 'educated' in the workings of life on the street. Does the 'educated' individual mean some one who can create amazing works of art? Or, does it indicate some one who has memorized and repeats certain culturally important texts and ideas?
There is certainly a cultural side to philosophy in Modern Western society that is largely anti-religious from the very beginning. I started out as your average fervent evangelical Christian, which I am no longer, but it was initially incredibly uncomfortable in a philosophy department to try to hold on to certain belief systems. However, it is not necessarily for the reasons that one would believe. It is a culturally phenomenon. In older generations, it was entirely unacceptable to be religious and be in philosophy. You were naturally routed towards theology by the university staff because the topics of conversation are entirely different; modern philosophy does not concern itself with the question of religion. Yet, the vast majority of older philosophy professors, when being honest, will acknowledge that despite their atheism there are still countless religious systems that have fascinating thinkers and concepts that are both rational and consistent.
It just so happens that in America, Christianity is the de facto symbol for religion and it is both irrational and inconsistent.