When you realize there are different groups of Rasta (same as Christianity) eg Baptists, Catholics, Anglicans, Non-denomationals...etc.
For Rasta you have houses such as - Bobo, 12 Tribes, Nyabinghi as well as other tie ins such as Eithopian Orthodox (which is a Christian branch), Fulfilled Rasta which again based on Christianity etc.
Then study what fits you... you will realize it isn't a CULT. It is a true religion. All religions branch out...
Haile Selassie teachings are good things to study, as well as the pro-black sides of some Rasta houses.
Bob Marley was 12 Tribes of Israel.
Capleton is Boboshanti... (pro black)
I would like to reason, but I am not very knowledgeable of all topics. Have been pursuing it on my own, though. Im in foreign, not much people to reason with locally.
I am a member here: Fulfilled Rastafari House
I have read the teachings of Haile and his quotes. (Can find some on playstore or google searches).
Read the Kebra Nagast also...
@Kalik