It may well be a genuine religious belief. That doesn't make it exempt from the judgement that it is also ludicrous. Religious beliefs are also fit for the Nonsense Detector, aren't they?
And extolling belief that is fairly plainly offensive shouldn't be deemed acceptable just because it is called religious. Should it? We're not allowed to persecute or be gratuitously offensive to Jews, or Catholics, or Protestants or Muslims or anyone just because our religion tells us to, so religious beliefs which are gratuitously offensive to the disabled should also not be acceptable on the grounds of religion.