Christadelphianism is another 'Christian cult'. They deny the trinity, and that Jesus is God, and like the JW's that Holy Spirit is not a Person, but a mere force.
One of their most atrocious lies is the belief that Jesus did not make atonement for our sin, and that God did not lay upon Him the sin of the world, but that he already had sin in Him because He was human. They view His death on the cross as more of an object lesson.
They believe that salvation is based on works, and by his own merit, which leads to a completely tyrannical rule over people and the resulting damage done to them by legalism.