Different studies show contrasted conclusions regarding any link between the two concepts, depending on whether "religiosity" is measured by religious practices (attendance at places of worship, for example) or specific religious beliefs (belief in miracles, for example), with notable differences between nations. In "western" countries, the higher the level of education, the more the religious practices increase, while certain religious beliefs decrease
several religious groups have much higher levels of education." He found that Hindus, Jews, Buddhists, and Orthodox Christians have the highest levels of education, Catholics, Mormons, and Muslims are at about the national average, and Jehovah's Witnesses have by far the lowest education
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Basically, as education increases, the beliefs in miracles/supernatural occurrences usually fall off. Religious practice may have more to do with social connections (I know some very educated, wealthy people who attend church to maintain social and business contacts).
Jehovah's Witnesses: the least educated and also believe in all kinds of supernatural phenomena, mostly of the "invisible" kind.