I can tell you've read a bit on the subject. The ability of some roaming soul to enter one's body while astral projecting is a common myth. It doesnt happen. You are correct about saying that everyon is born with the ability to astral project. As a matter of fact most people do it frequently especialy during childhood without ever knowing it or dismissing it as a dream. It would seem to me that there would be alotta possessed bodies walking around if astral projecting opened us up to this possibilty.

And you implied that I simply read about this and lacked faith and spirituality. You dont know me and that's far from the truth.

Perhaps some hallucinogens are powerful enough to make one think they are outta body. I;ve never been lucky enuogh to try any of these. Ketamine is known to induce OBE's in people. This is one reason that it's mainly used in vet medicine now. Most people like to remain in the physical. I;m not gonna pots any links. Do a web search and you'll find respected authors that detail this. Speficially look for Dr. Carl Jenson who wrote extensively on the subject while drawing from his own experience with the drug.