Psychedelic drugs and breaking through the veil

[zenmaster]

The astral plane is indeed the 4th dimension, but only for puposes of reason it is mentioned as such. In fact, there is no clear demarcation of spiritual levels at all. These are, in reality, levels of consciousness, and they are not hierarchical in nature. The astral plane is where most "people" (souls) go to when they graduate or pass on.

Having no clear demarcation of vibratory levels is completely beside the point. Following the Ra material, a "dimension" is a density which is demarcated based on its particular frequency band. You may want to read the Ra material to better understand the terminology. The Ra material is sort of the focus of this forum.

I have also tried shamanism, and the truth is, they also go as far as the astral plane

Utterly false. You may want to read up on the subject some time or perhaps talk to a shaman who is a little more experienced working within the various planes.

in fact, they are more concerned with levels lower than the third dimension, so I wouldn't use them as the finger pointing to the moon.

No one is using them as the finger pointing at the moon. It's simply the case that they have more experience in the various planes than most people here.