Welcome.
JWs and Christadelphians are very similar. Were you raised a Christadelphian? I was raised a JW, and one thing I could not come to terms with is that through an accident of birth I was to be saved, but everyone else, (including you), were to die at Armageddon.
I now find organised religion to be highly offensive. Most religious groups believe that you need to belong to their sect, or the tenet their sect is part of, in order to be acceptable to God. Yet a person has even less say over what they believe about God than what language they speak, it is predominantly due to where they are born.
Before looking into doctrine, you should research the history of the Bible canon. There is no consensus on which books even belong, since the canon was formed after hundreds of years of disagreement, and varies between Christian groups.