I think the reference about the Trinity has to with the Jesus Movement, late 60’s, early 70’s where there was a very strong evangelistic Christian revival and rejection of the drugged out hippie, hedonistic,and paradoxically nihilistic dogma of west coast “hip” population.
The Jesus Movement became the Calvary Chapel, one of the most dynamic Protestant denominations, at least in California. The Rev. Jack Hibbs, pastor of the Calvary Chapel in Chino Hills is one of Southern California's top conservative leaders.
First album I ever bought.