I just find it funny that you assumed that I was making an ignorant judgment. And numbskull? I haven't heard that since about 3rd grade.
You still haven't provided any rationale to prohibit religious-based consumption of mescaline.
Or consumption of it in general, for that matter.
It's an illegal drug - you can't do illegal stuff just for the sake of religion.
I'm sure that you would say the same of Christians in countries where Christianity is suppressed and/or banned. Of course they shouldn't be reading the Bible. It's illegal, after all!
Just because the religion under consideration here is not Christianity or some closely related cult does not mean that it should be excluded from sharing the same liberties that Christians and closely related cults do. And you have not even presented a sound argument as to why mescaline should be illegal. The fact that it is illegal at present is not a reason why it should be illegal, unless of course you are perfectly content to continue plodding along, dumbly accepting everything that the government force-feeds you as valid.