Research in other areas, like neuro-theology (literally the neurology of religion), suggests that there may be something to this.

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On Monday, two U.S. officials said preliminary evidence from an interrogation suggests the brothers were motivated by religion but were apparently not tied to any Islamic terrorist groups.

NPR: Aunt: Boston Bombings Suspect Struggled With Islam

However this is not being attributed to an upsurge in interest in religion - as the qualifications authority suggests that it reflects the growing interest in GCSE "short courses", which provide a qualification with less work than a conventional GCSE.

BBC: Religion pulls in GCSE students