The Best of Badfinger has some great stuff, but there's some great album tracks like "We're for the Dark" that are missing.
George produced some of Straight Up, I believe. Great album.
As for religions, I'd look for a book titled The Joy of Sects. It's a great book written from a wry perspective on the major and minor religions of the world. Good starting point.
All religion as I see it is about detachment or nonattachment from things that limit the spirit--ego, money, control, power, self, bling . . . yes, even bling.
It's the spiritual discipline to see "I am he as you are he as you are me and we are all together."
Also, watch out for element'ry penguins that become attached to chanting, wearing robes and drawing attention to themselves in airports.
As Neil Young sang: "I got religion at the airport, my Lord"