I was absorbed the year I graduated from college. They presented themselves as having done an independent study of the bible to reach a better understanding of what it said. They claimed not to have a clergy, they didn't believe in the trinity or hell, they were opposed to war (a big one for me) and it gave me a group to belong to. I also liked the idea of living forever on earth.
I left when I realized that all of the above was bullshit.