Jethro Tull released Aqualung in 1971. It is considered a concept album by many (an opinion disdained by the band), illustrating the conflicted views of Pro-God versus Anti-Religion. Interestingly, many of the tracks on the LP were acoustic, hard to notice on a record with so many iconic electric guitar riffs. Bruce Eder at allmusic.com writes:
The album’s “dour musings on faith and religion” have marked it as “one of the most cerebral albums ever to reach millions of rock listeners”
It led to many teens and young adults questioning the the conventional role of religion in the western world and probably helped eliminate some stigma from those choosing to abandon organized religion.