Christians, Jews, Muslims, Hindus, Buddhist, Mormons, Jehovah Witnesses, etc., say their doctrines are correct and others are at least somewhat wrong if not completely wrong. So isn’t this proof that all religions are wrong?
So if all Native Americans are found guilty by a certain judge, that judge can then assume all future Native American defendants are guilty? Each person deserves a fair hearing and it is discriminatory to determine guilt by association. Each religion deserves a faith hearing as well and it is just as discriminatory to conclude error without carefully evaluating the evidence.
In addition, associations can be faulty. Perhaps one defendant who was innocent was declared guilty. This could happen when a judge assumes the truth instead of carefully determining the truth. Perhaps Christianity has been assumed to be false from the outset and therefore all evidence then conforms to the guilty verdict.