Paul speaks frequently in his epistles about how the works of the Law were not necessary to be saved anymore. This is all fine and good. Now look at the C.A.R.M.'s major stretch of reasoning. This is the Law of Moses, which at this point had become obsolete. But the C.A.R.M. says, in other words, we are not saved by anything we do.
Baptism is necessary for salvation.
C.A.R.M.'s conclusion to this section is that Christadelphianism is a false religion. Only the blood of the real Jesus does that. I agree, sincerity cannot save us. However, the C.A.R.M. has not shown us that Christadelphianism is a false religion. The fact that Christadelphianism denies that Jesus is God in flesh is sufficient to make it a non-Christian cult.